Index: mod_python.py
===================================================================
--- mod_python.py       (revision 7609)
+++ mod_python.py       (working copy)
@@ -200,9 +200,12 @@
     return storage.get('style', None).file.read()

 def _read_style_gzip(storage):
-    style = StringIO(urllib.unquote_plus(storage.get('style', None).file.read()))
-    return gzip.GzipFile(fileobj=style, mode='r').read()
-
+    data = storage.get('style', None).file.read()
+    try:
+        return gzip.GzipFile(fileobj=StringIO(urllib.unquote_plus(data)), mode='r').read()
+    except gzip.zlib.error:
+        return gzip.GzipFile(fileobj=StringIO(data), mode='r').read()
+
 @accepts('POST')
 @check_session
 def refresh(req):