Somewhere between Trac changesets [11050] (0.13) and [11125] the trunk (dev) Trac broke access to svn. Best guess is [11082] broke it. Warning: Can't synchronize with repository "(default)" (Unsupported version control system "svn": Can't find an appropriate component, maybe the corresponding plugin was not enabled? ). Look in the Trac log for more information. After reviewing what seems like one of the top issues from a couple years ago, comparing the two revisions and noticing the refactoring of files like trac/versioncontrol/svn_fs.py, ./trac/versioncontrol/svn_prop.py, etc. and working through the tests in http://trac.edgewall.org/wiki/TracSubversion#unsupported-vcs ... I gave up for now and reverted back to [11050], things seem fine again. I assume others will hit this also. My config on the machine with Trac: httpd-2.2.15-1.fc12.2.i686 mod_python-3.3.1-11.i686 subversion-1.6.13-1.fc12.1.i686 There are no errors in the log while set to debug, I only see svn things like: 2012-07-17 12:48:54,115 Trac[loader] DEBUG: Loading tracopt.versioncontrol.svn.svn_fs from /usr/lib/python2.6/site-packages/Trac-1.0dev_r11125-py2.6.egg 2012-07-17 12:48:54,116 Trac[loader] DEBUG: Loading tracopt.versioncontrol.svn.svn_prop from /usr/lib/python2.6/site-packages/Trac-1.0dev_r11125-py2.6.egg I see that mod_python shows deprecated (seems seem to show as optional/supported). Nothing else on the machine has changed and reverting to [11050] makes things work fine. While using [11050], in General -> Repositories -> Type dropdown on the right contains: (default), direct-svnfs, svn, svnfs; with a Default: svn While using [11125] the dropdown only contains '(default)' If you have something else to try, please let me know. Thanks & FYI, -Jeff