Ozzy, In my testing in one game just running the fx command is borked. I created a new game and tested and the command worked fine. Then I tested in the new game a macro that is the Fire Bolt command with /fx command after (as stated above in the thread) and it worked. So I am guessing there is something wrong with certain characters. This is something that is going to require the Devs. I suggest filing a Help Center request with Roll20, make sure you check your console log when you get the error. I am seeing a console log error generated when the chat error is generated.