Re: enable_ptl seems to fail override import (quixote-1.0)

If it were me, I would start an interactive python shell
with the -v flag, import and call enable_ptl() and then
call __import__('main') (or "import main") to see if that
exposes anything unexpected.  Is there a stray "main"
somewhere on your path?

You noted that your test doesn't import 'main', but what
does happen?  Is it just an ImportError traceback?

You could try removing cimport.so, but I doubt if it has
anything to do with this.

There are a few packages in the world that don't seem to work
very well with the (standard) ihooks module that ptl uses.
ZODB was one of these (and may still be, I don't know), as was
biopython.  The cure for those seemed to be to import those
packages before calling enable_ptl().  You might try calling
enable_ptl() after importing everything else.