2 player freezing bug

Hi everyone, first post here so go easy on me. An upfront sorry if this is in the wrong place/shouldn't be asked. I did try searching for details on this error and ways to fix it, but didn't come up with anything.
Me and a buddy play Two Headed Giant a lot, with me on an PS2 controller (USB adapted), and him on the mouse and keyboard. The freeze happens when. 1) I zoom in on a card, and then 2) he clicks on one of his active cards in his hand. At this point my card is zoomed in and I can't use any of the buttons. (Escape on the keyboard doesn't bring up the menu, the game stays frozen with me zoomed in on a card.)
Can someone help us resolve this freeze by telling me what buttons should be pressed (on the keyboard maybe? it just occurred to me his card might actually be playing but we can't see any of it.)
The game in question is DoTP 2013 (with addon DLC, Firemind, and RTR Mod), they all seem installed/working fine. I also have Firemind's corefixes, and some unlocker .WAD's installed.
I don't think the problem is related to the wads or anything, it seems to be a game-wide problem (can confirm later with a vanilla version).
Sorry for the long post, and my personal thanks to the community here. The hard work put into the cards, creations, and management of this place is amazing, you guys truly are ace.
PS - If anybody has questions about the setup or more information please just ask, I'll glady provide what I know.
Me and a buddy play Two Headed Giant a lot, with me on an PS2 controller (USB adapted), and him on the mouse and keyboard. The freeze happens when. 1) I zoom in on a card, and then 2) he clicks on one of his active cards in his hand. At this point my card is zoomed in and I can't use any of the buttons. (Escape on the keyboard doesn't bring up the menu, the game stays frozen with me zoomed in on a card.)
Can someone help us resolve this freeze by telling me what buttons should be pressed (on the keyboard maybe? it just occurred to me his card might actually be playing but we can't see any of it.)
The game in question is DoTP 2013 (with addon DLC, Firemind, and RTR Mod), they all seem installed/working fine. I also have Firemind's corefixes, and some unlocker .WAD's installed.
I don't think the problem is related to the wads or anything, it seems to be a game-wide problem (can confirm later with a vanilla version).
Sorry for the long post, and my personal thanks to the community here. The hard work put into the cards, creations, and management of this place is amazing, you guys truly are ace.

PS - If anybody has questions about the setup or more information please just ask, I'll glady provide what I know.