diff --git a/src/calibre/ebooks/oeb/polish/container.py b/src/calibre/ebooks/oeb/polish/container.py
index b8fd8e2c18..61a645badf 100644
--- a/src/calibre/ebooks/oeb/polish/container.py
+++ b/src/calibre/ebooks/oeb/polish/container.py
@@ -310,8 +310,8 @@ class Container(object):  # {{{
             for elem in self.parsed(name).xpath('//*[@src]'):
                 yield (elem.get('src'), elem.sourceline, 0) if get_line_numbers else elem.get('src')
 
-    def abspath_to_name(self, fullpath):
-        return self.relpath(os.path.abspath(fullpath)).replace(os.sep, '/')
+    def abspath_to_name(self, fullpath, root=None):
+        return self.relpath(os.path.abspath(fullpath), base=root).replace(os.sep, '/')
 
     def name_to_abspath(self, name):
         return os.path.abspath(join(self.root, *name.split('/')))
diff --git a/src/calibre/gui2/tweak_book/preview.py b/src/calibre/gui2/tweak_book/preview.py
index 5e0c7fb11f..a6df907c63 100644
--- a/src/calibre/gui2/tweak_book/preview.py
+++ b/src/calibre/gui2/tweak_book/preview.py
@@ -238,6 +238,7 @@ class NetworkAccessManager(QNetworkAccessManager):
 
     def __init__(self, *args):
         QNetworkAccessManager.__init__(self, *args)
+        self.current_root = None
         self.cache = QNetworkDiskCache(self)
         self.setCache(self.cache)
         self.cache.setCacheDirectory(PersistentTemporaryDirectory(prefix='disk_cache_'))
@@ -251,7 +252,7 @@ class NetworkAccessManager(QNetworkAccessManager):
                 path = path[1:]
             c = current_container()
             try:
-                name = c.abspath_to_name(path)
+                name = c.abspath_to_name(path, root=self.current_root)
             except ValueError:  # Happens on windows with absolute paths on different drives
                 name = None
             if c.has_name(name):
@@ -306,6 +307,14 @@ class WebPage(QWebPage):
         self.mainFrame().javaScriptWindowObjectCleared.connect(self.init_javascript)
         self.init_javascript()
 
+    @dynamic_property
+    def current_root(self):
+        def fget(self):
+            return self.networkAccessManager().current_root
+        def fset(self, val):
+            self.networkAccessManager().current_root = val
+        return property(fget=fget, fset=fset)
+
     def javaScriptConsoleMessage(self, msg, lineno, source_id):
         prints('preview js:%s:%s:'%(unicode(source_id), lineno), unicode(msg))
 
@@ -408,6 +417,11 @@ class WebView(QWebView):
             page margins and embedded fonts that use font name aliasing.
 
             '''))
+        self.page().current_root = None
+
+    def setUrl(self, qurl):
+        self.page().current_root = current_container().root
+        return QWebView.setUrl(self, qurl)
 
     def inspect(self):
         self.inspector.parent().show()
@@ -565,6 +579,10 @@ class Preview(QWidget):
         self.view.clear()
         self.current_name = None
 
+    @property
+    def current_root(self):
+        return self.view.page().current_root
+
     @property
     def is_visible(self):
         return actions['preview-dock'].isChecked()