The win64 buildbot testing stage hangs. The only thing that I can see is (I have no time to investigate further) in processexplorer: 'python -E -tt ../lib/test/regrtest.py -uall -rw' has started this process which hangs: 'cmd /c ""C:\Program Files (x86)\Microsoft Visual Studio 8\VC\vcvarsall.bat" x64 & set" Thomas