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The comment in BUGS.txt is too mysterious to make any sense
to me. It basically says "it appears there is some problem,
let me know if you understand it". This was fine as it
stands, but it didn't say "this is because there is a Tcl
error that is dropped by Python", and so far, you haven't
indicated that this is indeed the problem.

Uncommenting the line, I get tons of "bad window path name"
and "invalid command name" messages when running
tixwidgets.py. This tells me that
a) this might happen quite frequently in real life, and
b) the user of the Python application can do nothing about
it, they can't even disable the first message (it then asks
whether further messages should be skipped)

I don't feel privileged to approve a change here; you should
bring this up on python-dev. My feeling is that the Tcl
error message is too annoying to just remove the tkerror
command; printing the message to stderr might be acceptable.