It's when I use a bashed patch it screws up. Any ideas?
The sections you have to check for FCOM are listed in the FCOM release thread, and you may need to check out the MMM thread, for the recommended Tweak Settings- I always recommend using the AI: Max Active Actors [MMM Default 40] instead of the setting that Wrye Bash uses, and I actually have started using [100] myself.
Be careful what you do check when you build your Bashed Patch, In Tweak Actors do not place a check in the MAO patch if you do not have Mayus Animation Overhaul in your Load Order. I do not have my laptop handy to give you ideas of what to check in each section, and I need to see what mods you have active to give advice about what you need to check. I will edit this after I fire up my laptop.