Seriously. This is ridiculous. I have reported this many times and I'm sure many others have as well.
For my characters, whenever I use a clicky/boost/or enhancement ability my weapon disappears and it does not come back until I swing. You may say "oh no big deal" but for my fighter it is game breaking.
For my fighter my ultimate attack is adrenaline + momentum swing. HOWEVER activating adrenaline makes my weapon disappear AND momentum swing can't activate with a missing weapon apparently.
If you can't fix it at least put it in the know issues list so I can at least HOPE someday you'l get around to it.