I've started playing Oblivion again, and have a pretty major bug... Going through certain doors deactivate my Magic-- I can still cast a Spell, but the animation does not play, and none of the effects are applied.

It is 100% consistent on which doors do it, but it seems to be very random which doors; for example, going in to Bravil will deactivate my Magic, whilst using the Imperial City gates won't. I can go in and out of the arena a dozen times, but using the door to the combat area will trigger the issue.

I'm using the old Disk Versions, patched up to the latest patch + SI.

I can't list Mods right now, because I'm doing a re-install, but all I had was:

- All Unique Landscapes

- Full Better Cities

- UOP

- UOP - DLC

- UOP - Knights

- UOP - Shivering Isles

- All DLC

Removing the UOP - Thieve's Den patch fixed it on certain doors, but then it still exists on other doors, which makes me think it might be related to UOP, but... I've no idea why, since I don't think the TD patch touches places like Bravil?