If you are in the talents menu when someone initiates a map vote, you will not see the menu come up. You cannot vote on it, and the team will have to wait for the vote to timeout before being able to initiate another vote.
This does not happen every time, and I could not get it to happen when testing for it. I will update this thread with a console log when I manage to catch it again. If anyone else has a log for this issue, please add it as well.