Hello,

Can anyone tell me what might be the cause of MPC to suddenly stop working for .MTS files?

Panasonic's "AVCHD light" codec from their cameras encodes to this format, and MPC was my favorite viewer to watch them with until it suddenly stopped working.
Click to view attachment

-MPC seems to play all other formats just fine
-It does NOT appear to be a codec problem because WMP, VLC, etc can play the .MTS videos fine.
-the only significant thing I can remember doing before the problem was encode a video in Sony Vegas. . .

Attempts to fix the problem
- I'm pretty sure I installed a new Nvidia Graphics driver after the problem, but not sure (just for info)
- I've tried upgrading both 64-bit + 32-bit K-light codec packs . . .
- I've tried installing a stand alone MPC

Also:
I have Core AVC installed, could this be causing a conflict somehow?

I've tried everything I can think of, any ideas?
Thanks