I'm having this same issue with the support indicator jumping all over place as I'm trying to place the support. The indicator is NEVER aligned with my mouse pointer which it was two days ago. Suddenly it no longer works properly and has stopped my production. I'll have to use other programs for the time being. I have encountered this issue across several releases and I have no idea WTH is going on...
toggling the viewport between perspective and orthographic and back via the eyeball icon seems to correct it
UPDATE: looks like if you exit support mode, switch to perspective viewing and then add supports the issue is resolved. must be an issue with chitubox not correcting the pointer for orthographic viewing
Thanks, Micron Madness. I'll give that a try next. I ended up completely reinstalling it after wiping out all appdata. So far it has been working flawlessly.