We recently did a change (the arrow-buttons in the scrollbar were missing, see https://github.com/dashpay/dash/pull/304), which might as a side-effect fix this as well, but since I'm lacking a OSX-test-system I don't know. (Windows and Linux do not show this problem).
Small bug on mac wallet under transactions the end of the amounts is obscured by the scrollbar.
*I posted this in the wrong thread before I think - apologies if already addressed
It's not yet in the official binaries, but if you know how to build a OSX-version from the official master-branch (https://github.com/dashpay/dash) you can test it yourself.
I could build OSX-binaries for you to test if you want, though.