DO 12.0.4. I created a test toolbar button but inadvertently left "else" off the 2nd half of an @ifset pair so it looked like this:
@ifset:HIDEFILTERFOLDERS=*
Help
@ifset:
Help ABOUT
On activating the toolbar, Opus crashes. Adding the missing "else" fixes the problem.
Toolbar with broken button and zipped matching DMP attached.
Regards, AB
[attachments removed as no longer needed]