If something aggros me I cant see its target frame, and therefore also ToT and ToTT. If I initiate combat its all fine. I'm using the latest version: r26115 and running a lot of other stuff. Trial and error for a conflicting mod could take me quite a while.
Edit - Rolled back to an earlier version and all seems good.
Edit 2 - No actually I just copied the new version over my old backup version. I even amaze myself sometimes with how much of a complete f***ing moron I can be. Seems to work tho. Bizarre.