Erroneous "Push Failed" (RhodeCode / Mercurial)

We run a Mercurial server with RhodeCode. I created a new project in PyCharm 2.7.2 in Windows, created a local repository. I can commit to the local repository, and push my changes to the remote repository. The changes show up in that repository, but every push, PyCharm gives me a "Push Failed" error. Whilst not as frustrating as a push that appears to succeed but doesn't, I'd like to resolve the issue so things act more ... cleanly.

How can I go about debugging this?