1.) Reported by Mkurz
The "Start Samba Server" does not create proper shares. The script /usr/sbin/sambastart does not write a correct /etc/samba/smb.conf file. It has worked in Version till 4.02, but with 5.0 it does not.
2.) Reported by phil42
If the panel is moved to the top of the screen, hidden, and the panel-hiding buttons are removed, it does not reappear when the pointer moves to the top of the screen.