Look for an Add-Ins tab. If the Mac version works like the Windows version, you will find the buttons from your custom toolbars there.

Hello Charles,

thanks for your reply.
I do see the buttons under the Add-ins tab. The problem is that there are multiple drop-down buttons that won't work when I click on them. A single button (with a single action) does work.

Somehow the drop-down menu buttons won't work.