I just upgraded to Version 18 from 16 and when I try to access the Galleries, particularly Color Gallery - any color palettes, the program goes into continuous "thinking" loop (spinning circle), not responding. Effectively freezes and must be rebooted to exit.
This does not happen in version 16, I tried. I have updated to version 18.5.0 but this did not fix anything.
Any ideas?

Update - non of the Galleries respond.