It's hard to say for sure, just guessing...
Ram = 192
It's not that much and, indeed, graphical stuffs use a lot of RAM, could be a problem from time to time...
Firewall kerio 4 Disabled at this moment
If you uninstall Kerio, will the icons stay there?
Kerio is having some issues when used with avast. Leftovers in the screen, freezes... :'(
Another antivirus was removed before install avast
Which was it?