Okay soooo.

I was checking through the toricredit shop ingame. (all sections, this bug is about the grabbing color section)
And once I was done, I went to multiplayer room and what happened, was that the hand was grabbing all the time. I couldn't click on the hand to ungrab or anything for the whole 20 matches I was playing. I then proceed to change room and I still have the same problem. Even single player.

here is a screenshot basically what happened...

http://gyazo.com/550d797a2927263c12d211029ce67b0b

Did you try pressing V?

Yeah it's a thing unfortunately. Already fixed in the next update, it's going to be live on Steam quite soon.