So that's what the errors in the log are
I'll have to look into this, still not 100% familiar with the user criteria system in Xen but it shouldn't be too hard to sort out either.
Looks like the code was depending on the user having a frame set, instead of a setting in the relevant section - I've updated it now, can you try change a setting -> save -> change the setting back to what you want -> save again for both your custom title and postbit settings, and see if that fixes it?