As I mentioned in IRC earlier this week, svnlook_tests.py 12 was failing for me on Windows over ra_neon and ra_serf (svnlook_tests.py 11 on the 1.6.x branch).
The test failed when the python pre-commit hook failed to write the output of 'svnlook -t' to a temporary file. Thing is, breaking a debug mid-way through the tests' commit so the transaction file was still present, and running svnlook from the command line worked fine. Heck, even running the hook script from the command line worked. At first I thought that only a release build of Apache was susceptible; running the tests again a debug version of httpd.exe worked fine. Somewhat belatedly I tried running against a manually started release build of httpd.exe and damn if it didn't work too. So it seems something is amiss with my Apache InstallBin target, though what I'm not yet sure (and honestly won't be spending any more time trying to figure out unless someone else has the same problem). Anyhow, I mention all of this because for me it would have blocked 1.6.11, but all is good now. Paul