Looking at variants. I've got the drop box to select from my list of variants, and I've got the button to view the variants dialog. I hit the SCH "complied view" tab (or whatever it's called), Variants toolbar doesn't change. WTF, where's my big red 'X' button?
Right click / customize... drag 'X' button onto toolbar.
Two 'X' buttons magically appear!
Thanks, Altium

Drag extra button off, everything is normal.
That is all...

Tim