This happens all the time. When I Alt-Tab out of the session to another window on my computer, when I go back to the session, the Alt key is stuck down, or the shift key is stuck down. This happens multiple times per day, its horrible. I have to completely exit the viewer and the entire program, then go back into it. Multiple times, everyday, and it happens on multiple computers.
My local computer is Windows 10. The computers I connect to are various, XP, 7,8,10.
It is NOT sticky keys. I don't push the same key 5 times and activate the accessibility features.
It's like remote utilities doesn't realize that the keys have been released.
I can't reproduce it 100% in a normal way, but I can force it to happen if I hold SHIFT while I minimize the session and then click into another program, and then release shift. The client doesn't see me release shift that way. When I go back to the session, shift is still active.
Although that's not an exact replica of what really happens, maybe something similar to that is happening with the ALT key sometimes when you alt tab back into the program sometimes.
I don't know if that example helps or not, but it is way to force a similar situation.
I have also noticed this bug, with the Viewer version 18.104.22.168, and the new beta Viewer. I mostly noticed it after trying to copy and paste between my local machine and the remote machine, with ctrl-c and ctrl-v. The copy-paste operation does not work and then the ctrl key is stuck when I minimize the Viewer and try to do anything else on my local machine. A couple of taps on the control keys on my local keyboard clears out the stuck issue.
I haven't reported this before because I thought I was just me.