diff --git a/pywb/rules.yaml b/pywb/rules.yaml
index 757d7da7..8ce6e017 100644
--- a/pywb/rules.yaml
+++ b/pywb/rules.yaml
@@ -138,8 +138,8 @@ rules:
 
     - url_prefix: 'com,googlevideo,'
 
-    #fuzzy_lookup: 'com,googlevideo.*/videoplayback?.*(id=[^&]).*(mime=[^&]).*(signature=[^&])'
-      fuzzy_lookup: 'com,googlevideo.*/videoplayback?.*(id=[^&]).*(mime=[^&])'
+      fuzzy_lookup: 'com,googlevideo.*/videoplayback?.*(id=[^&]).*(mime=[^&]).*(signature=[^&])'
+    #fuzzy_lookup: 'com,googlevideo.*/videoplayback?.*(id=[^&]).*(mime=[^&])'
 
 
     # testing rules -- not for valid domain
diff --git a/pywb/static/wombat.js b/pywb/static/wombat.js
index 2f599bc4..971a8fe4 100644
--- a/pywb/static/wombat.js
+++ b/pywb/static/wombat.js
@@ -20,7 +20,7 @@ This file is part of pywb, https://github.com/ikreymer/pywb
 //============================================
 // Wombat JS-Rewriting Library v2.1
 //============================================
-window._WBWombat = (function() {
+_WBWombat = (function() {
 
     // Globals
     var wb_replay_prefix;
@@ -511,6 +511,7 @@ window._WBWombat = (function() {
 
     //============================================
     function init_image_override() {
+        window.__Image = window.Image;
         window.Image = function (Image) {
             return function (width, height) {
                 var image = new Image(width, height);
@@ -522,16 +523,40 @@ window._WBWombat = (function() {
 
     //============================================
     function init_date_override(timestamp) {
+        timestamp = parseInt(timestamp) * 1000;
+        var timediff = Date.now() - timestamp;
+
+        window.__Date = window.Date;
+        window.__Date_now = window.Date.now;
+
         window.Date = function (Date) {
             return function (A, B, C, D, E, F, G) {
-                if (arguments.length == 0) {
-                    timestamp = parseInt(timestamp) * 1000;
-                    return new Date(timestamp);
+                // Apply doesn't work for constructors and Date doesn't
+                // seem to like undefined args, so must explicitly
+                // call constructor for each possible args 0..7
+                if (A === undefined) {
+                    return new Date(window.Date.now());
+                } else if (B === undefined) {
+                    return new Date(A);
+                } else if (C === undefined) {
+                    return new Date(A, B);
+                } else if (D === undefined) {
+                    return new Date(A, B, C);
+                } else if (E === undefined) {
+                    return new Date(A, B, C, D);
+                } else if (F === undefined) {
+                    return new Date(A, B, C, D, E);
+                } else if (G === undefined) {
+                    return new Date(A, B, C, D, E, F);
                 } else {
                     return new Date(A, B, C, D, E, F, G);
                 }
             }
         }(window.Date);
+
+        window.Date.now = function() {
+            return __Date_now() - timediff;
+        }
     }
 
     //============================================
@@ -874,7 +899,7 @@ window._WBWombat = (function() {
         init_seeded_random(timestamp);
 
         // Date
-        init_date_override(timestamp);
+        // init_date_override(timestamp);
 
         // expose functions
         this.extract_orig = extract_orig;
@@ -882,4 +907,6 @@ window._WBWombat = (function() {
 
     return wombat_init;
 
-})(this);
+})();
+
+window._WBWombat = _WBWombat;
diff --git a/pywb/ui/head_insert.html b/pywb/ui/head_insert.html
index 36563167..65397c9d 100644
--- a/pywb/ui/head_insert.html
+++ b/pywb/ui/head_insert.html
@@ -3,12 +3,14 @@
 <script src='{{ wbrequest.host_prefix }}/{{ static_path }}/wombat.js'> </script>
 <script>
   {% set urlsplit = cdx.original | urlsplit %}
+  if (window && window._WBWombat) {
   var _wb_wombat = new _WBWombat("{{ wbrequest.wb_prefix}}",
                  "{{ cdx['timestamp'] if include_ts else ''}}",
                  "{{ urlsplit.scheme }}",
                  "{{ urlsplit.netloc }}",
                  "{{ cdx.timestamp | format_ts('%s') }}",
                  "{{ wbrequest.wb_url.mod }}");
+  }
 </script>
 {% endif %}
 <script>
diff --git a/pywb/webapp/live_rewrite_handler.py b/pywb/webapp/live_rewrite_handler.py
index 39a7f565..8a7d1aa4 100644
--- a/pywb/webapp/live_rewrite_handler.py
+++ b/pywb/webapp/live_rewrite_handler.py
@@ -74,18 +74,27 @@ class RewriteHandler(SearchPageWbUrlHandler):
         proxies = None  # default
         ping_url = None
         ping_cache_key = None
+        ping_range_header = None
 
         if self.default_proxy and range_cache:
             rangeres = range_cache.is_ranged(wbrequest)
             if rangeres:
+                url, start, end, use_206 = rangeres
                 proxies = False
 
+                # force a bound on unbounded range
+                if use_206 and wbrequest.env['HTTP_RANGE'].endswith('-'):
+                    range_h = 'bytes={0}-{1}'.format(start, end)
+                    wbrequest.env['HTTP_RANGE'] = range_h
+                    print('BOUNDING: ' + range_h)
+
                 hash_ = hashlib.md5()
-                hash_.update(rangeres[0])
+                hash_.update(url)
                 ping_cache_key = hash_.hexdigest()
 
                 if ping_cache_key not in range_cache.cache:
-                    ping_url = rangeres[0]
+                    ping_url = url
+
 
         result = self.rewriter.fetch_request(wbrequest.wb_url.url,
                                              wbrequest.urlrewriter,
@@ -120,21 +129,25 @@ class RewriteHandler(SearchPageWbUrlHandler):
                        'https': self.default_proxy}
 
             headers = self._live_request_headers(wbrequest)
-            print('PINGING PROXY: ' + url)
-            resp = requests.get(url=url,
-                                headers=headers,
-                                proxies=proxies,
-                                verify=False,
-                                stream=True)
+            headers['Connection'] = 'close'
 
-            # don't actually read whole response, proxy response for writing it
-            resp.raw.close()
-            resp.close()
+            if key in range_cache.cache:
+                return
 
-            # mark as pinged
-            range_cache.cache[key] = '1'
+            try:
+                # mark as pinged
+                range_cache.cache[key] = '1'
 
-            return None
+                resp = requests.get(url=url,
+                                    headers=headers,
+                                    proxies=proxies,
+                                    verify=False,
+                                    stream=True)
+
+                # don't actually read whole response, proxy response for writing it
+                resp.close()
+            except:
+                del range_cache.cache[key]
 
         def check_buff_gen(gen):
             for x in gen:
diff --git a/pywb/webapp/rangecache.py b/pywb/webapp/rangecache.py
index fe3fae39..3903814e 100644
--- a/pywb/webapp/rangecache.py
+++ b/pywb/webapp/rangecache.py
@@ -14,6 +14,8 @@ class RangeCache(object):
     YOUTUBE_RX = re.compile('.*.googlevideo.com/videoplayback')
     YT_EXTRACT_RX = re.compile('&range=([^&]+)')
 
+    DEFAULT_BUFF = 16384
+
     @staticmethod
     def match_yt(url):
         if not RangeCache.YOUTUBE_RX.match(url):
@@ -51,7 +53,17 @@ class RangeCache(object):
 
             use_206 = True
 
-        return url, range_h, use_206
+        # force bounded range
+        range_h = range_h.split('=')[-1]
+        range_h = range_h.rstrip()
+        parts = range_h.split('-', 1)
+        start = int(parts[0])
+        if len(parts) == 2 and parts[1]:
+            end = int(parts[1])
+        else:
+            end = start + self.DEFAULT_BUFF - 1
+
+        return url, start, end, use_206
 
     def __call__(self, wbrequest, digest, wbresponse_func):
         result = self.is_ranged(wbrequest)
@@ -62,9 +74,8 @@ class RangeCache(object):
                                  *result)
 
     def handle_range(self, wbrequest, digest, wbresponse_func,
-                     url, range_h, use_206):
+                     url, start, end, use_206):
 
-        range_h = range_h.split('=')[-1]
         key = digest
         if not key in self.cache:
             response = wbresponse_func()
@@ -90,20 +101,10 @@ class RangeCache(object):
 
         filelen = os.path.getsize(spec['name'])
 
-        range_h = range_h.rstrip()
-
-        if range_h == '0-':
-            range_h = '0-120000'
-
-        parts = range_h.rstrip().split('-')
-        start = parts[0]
-        #start = start.split('=')[1]
-        start = int(start)
-
         maxlen = filelen - start
 
-        if len(parts) == 2 and parts[1]:
-            maxlen = min(maxlen, int(parts[1]) - start + 1)
+        if end:
+            maxlen = min(maxlen, end - start + 1)
 
         def read_range():
             with open(spec['name']) as fh: