Here is a current list of known issues for Patch 3.0 (as per u/fatshark_hedge):
- Windows 7 Users need to await hotfix for 100% startup crash
- Item Filter MOD can cause GK not to be able to equip 2nd melee item
- Armory MOD is affected
- Loadout Manager might be squiffy
- UI Improvements vomits loads of errors in to chat
- talent descriptions are awaiting an update, may report incorrect numbers or %