Searching in the logfile, I found these lines:
PHP Code:
120229:163106 winmgr[1080]: D lua:dbg::vis changed L:A_N:titleBar_ID:system vis =false
PHP Code:
120229:151445 winmgr[1079]: D lua:dbg::vis changed L:A_N:titleBar_ID:system_TV:force vis =true
These should be logs of titlebar removed and titlebar restored.