If a VMware instance (full-screen) and a TiemViewer (last Version) session is running at the same time, the Commandbar can no longer be activated/operated...
The only way out is to virtually leave the VM via CTRL + ALT and use the Windows key to reach the host's start bar or switch to TeamViewer or another application.
When you quit TeamViewer, the Commandbar etc. will work normally again.