Can't choose a menuitem from opened classic menu, because the whole menu closing and disappearing when something change on the tray, e.g. new updates available, wireless network connected. 
The basic kickoff menu works as expected.

Reproducible: Always

Steps to Reproduce:
1. Log in to desktop with classic menu enabled
2. Open the menu and browse a submenu, hover on an item
3. Wait
Actual Results:  
Menu disappears. Open again, browse again, pray for be quicker than unknown app that close the menu.

Expected Results:  
Menu remaining open