After performing a fresh install (debian) with 2.13-4, there are some odd things going on:
1. The "Tasks" module (TODO) does not work. You can fill out the form, but tasks will never show up in the "Task" view.
2. User groups are not always available in the "Read/Write Permissions" tabs. I have a user group named "QA", and it does not show up in the list of groups for my Calendar permissions.
I tried updating to the latest CVS source, but these issues did not go away.