Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Help/Tips/Tricks No longer able to equip two handers.

Were you only able to equip the weapon due to a strength bonus on the weapon, or a bonus from food that wore off or other equipment that was changed?

If you email supportdos@larian.com, with zipped save, I can check it in 1.0.219 (GOG version) and see if there was actually a change in the patch.
Each save is a folder in the '..\Documents\Larian Studios\Divinity Original Sin\PlayerProfiles\<ProfileName>\Savegames' folder. For Windows you can also just use the D:OS support tool to generate a report.zip file and then delete all the saves from the zip except the last one before the update.