Planning Dimension Security Error

Hello;

I am trying to modify and remove a few groups that have assigned security to our version dimension.

I'm getting an error (vague error) when attempting to modify a group's access from Read to write.

We used to do this all the time and this seems to be a new issue.

Strange part is that only some groups seem to be affected.

Version: 11.1.2.4.006

EPMA app

I found a few posts about this in MOSC and checked the logs but did not find anything relevant or useful in the planning log.

Is the only fix to delete all the groups and redo the security?