Seems like very corrupt data indeed! I can't say I have ever seen or even read about the triangle, so I can only be guessing what it means.

In any case, have you tried the 'check data' in the PlayOnline Viewer menu? That's something I'd first try, but if it can not resolve the issue, I'd try a complete and clean re-install of the game (yes, I know it is far from a fun procedure). From your description of the issue, it does seem more like a local issue to me, than anything that can be helped from the server side, but it's not impossible either, of course.


Let me know if the check fixes anything.
Good luck!