I'm seeing an odd issue with the Timestamper and the Mercurial plugins. The final steps of the Mercurial update fail like so:
The hg log command works like that from the command line. It also worked before installing the Timestamper plugin. And, indeed, after disabling the Timestamper plugin, things start working again:
Not sure how exactly the Timestamper plugins injects the timestamp into the log. But it seems to interfere with the output that the Mercurial plugin expects.