Following up on my earlier post... I svn up'd both my g5 and my g4 powerbook (both running OSX 10.4.8, gcc 4.0.0 apple build 5026), built and tested both. The test suite completed fine on my powerbook, failed on the g5. I tried running regrtest.py twice more on the g5 with the -r flag. It failed the first time, succeeded the second. I then made a series of run with the -f flag (thank you once again for that Señor Peters). I whittled it down to the following reliably failing pair: $ ./python.exe Lib/test/regrtest.py -l -f tests test_ctypes test_sqlite test test_sqlite failed -- errors occurred; run in verbose mode for details 1 test OK. 1 test failed: test_sqlite For confirmation, this pair works fine on my g4 powerbook. I've gone no further so far. It's bedtime. Maybe someone else can at least try to reproduce what I've come up with so far on other platforms or on another Mac g5. Skip