Chat not working

The chat doesn't work on the main page. I've tried clearing the chat log, disabling my extensions, clearing the cache and using a different browser and nothing works. The chat only shows up to a certain roll, but when I try to do anything after that it doesn't display and all the other text boxes go blank. This is only happening on our version of Lost Mines of Phandelver.

This sounds 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.