V6.4
(only) docked Zebra windows freeze when grasshopper is loaded, I’m unable to change the zebra stripe size
when grasshopper is loaded on my 2nd screen
I know that it’s not the most important fix needed, but a bug report is a collective concern 
@julz does this mean that it does work for you when GH is loaded on the first screen?
Yes exactly, only when grasshopper is loaded on the 2nd screen