Loaded up the game today after installing Heavy Metal yesterday. I tried out several different saves and experianced the same problem in each one.

Every attack made by player or the AI just misses 100% of the time.

Game worked fine yesterday after installing the new DLC, but today it's a miss fest. I'm clearly looking at a bug.

Can anyone help?

Verify your game files. I had a problem after buying all DLC were the enemy mechs could not be destroyed fully. Verifying and going back to a earlier save fixed it.

This game is bloody unstable if you shake it up a little.

If you try to play with corrupted files it is more than a little shaken up.