Thanks for the tip: place the commands on the toolbar.
UPDATE:
We are working on a systematic fix for a lot of these UI issues. We hope to be able to address this. Unfortunately, nobody here can reproduce it. Without a way to reproduce it, we have no idea how to fix it, or if a systematic fix would correct this behavior. I can say that in my testing of this build I consistently see tooltips normally, FWIW, on Mac and Windows machines.
After the early November update please let us know if the problem is gone. If not, we'll have to try harder.
Thanks for your patience with this.
Regards,
Phil Eichmiller
Software Engineer
Quality Assurance
Autodesk, Inc.