help with debugging

[varol kaptan]

Hi,

I have a weird problem:

Mercurial 1.4.3 / TortoiseHG 0.9.3, no extensions, winxp.

I am trying to commit a change in one file (~ 10Mb xls on winxp) and
after about 5-10 seconds the command prompt comes back without any
error message. A subsequent "hg status" reveals that the commit did
not happen. There is an unfinished transaction and a wlock file in
.hg/ (If I run the commit command again, mercurial advises me to run
hg recover first.)

I've tried running hg with -v --debug --traceback without any success.
Something obviously goes wrong at some point but nothing is displayed
on the screen. The same commit succeeds on a linux box with Mercurial
1.2.1 if I copy the directory and remove the lock file(s). Version
1.2.1 on the xp box does not work either - same as 1.4.3.

Any suggestions on how to diagnose such a problem?

Thanks in advance
Varol Kaptan