Rolling Any Clickable Attack/Feature Makes All Text Disappear in Chat

This only seems to be happening in one of my games. All my games use the 5e OGL Roll 20 Sheet for D&D 5e. When I load into this game, the chat shows up as usual, but upon clicking any action, there is a pause, the new info doesn't pop up, and everything gets redacted as below. Any idea what would be causing this in one specific game? I should add that this happens to the chat window even if I just manually roll /r 1d6 or with an inline roll in the chat box, or even just plain text. Reloading the page makes the chat come back, but putting anything into the chat kills it again.

This looks like a corrupted Chat Archive. A game's Creator is often able to fix issues with their Text Chat by  clearing the Chat Archive  (note: not  clearing your current Chat Log ). A GM might want to copy/back up the Chat Archive before the Creator clears it.

Keith, a thousand thanks. That fixed it!