This came up once before. If you hover over the character name field there is a little blurb about it. You can try something besides parenthesis and it will probably be fine. The closing ")" seems to be the main culprit. I might border the field in red if/when the character name includes something that could cause issues just help others avoid this. UPDATE: I've now i ncluded a check when changing the character_name that tests for illegal characters. Specifically ')', ']', '}', or '|'. These may break sheet rolls/macros if included in a character's name. Underscores, dashes, and apostrophes should be fine. #13200 Update pending.