=== trac/db_default.py
==================================================================
--- trac/db_default.py  (revision 4721)
+++ trac/db_default.py  (local)
@@ -408,7 +408,7 @@
   ('ticket', 'default_component', 'component1'),
   ('ticket', 'restrict_owner', 'false'),
   ('header_logo', 'link', 'http://trac.edgewall.com/'),
-  ('header_logo', 'src', 'trac_banner.png'),
+  ('header_logo', 'src', 'common/trac_banner.png'),
   ('header_logo', 'alt', 'Trac'),
   ('header_logo', 'width', '236'),
   ('header_logo', 'height', '73'),
=== trac/web/chrome.py
==================================================================
--- trac/web/chrome.py  (revision 4721)
+++ trac/web/chrome.py  (local)
@@ -219,7 +219,10 @@
             logo_src_abs = logo_src.startswith('http://') or \
                            logo_src.startswith('https://')
             if not logo_src.startswith('/') and not logo_src_abs:
-                logo_src = href.chrome('common', logo_src)
+                if '/' in logo_src:
+                    logo_src = href.chrome(logo_src)
+                else:
+                    logo_src = href.chrome('common', logo_src)
             req.hdf['chrome.logo'] = {
                 'link': util.escape(logo_link), 'src': util.escape(logo_src),
                 'src_abs': util.escape(logo_src_abs),