Hi Peter,
Something is definitely weird here. I have found that all I have to do is click out of the timeline...
not just into the inspector for it to work. When I am in the timeline and I attempt to use zoom shortcuts I get character entries in the top right timecode area of my viewer. (as per attached)
I can set command - for zoom out but I cannot enter command= for zoom in, it will not let me enter it no matter what I try. I could enter shift- and shift= as shortcuts but this still functions the same incorrect way.
Interestingly with the shift shortcut combo a + character shows up in the top right timecode display of my viewer when hitting shift = but no character from the shift - enters at all.
Hope this clarifies the bug. (Just an FYI this issue occurs on my iMac at home also and both systems are running studio 15 B5)

- Screen Shot 2018-06-19 at 7.25.29 am.png (3.38 KiB) Viewed 3260 times

- Screen Shot 2018-06-19 at 7.33.30 am.png (3.72 KiB) Viewed 3260 times