I upgraded from 11.10 to 12.04 as soon as it was out of beta, and have been plagued by a problem ever since. After my computer has run for a few hours (maybe around 4 or so), I can't open any new programs from the Unity Launcher. If I try to open them from the command line (in the example below, I'm attempting to open Chrome), I get the following message:
Maximum number of clients reachedMaximum number of clients reached
(chromium-browser:29820): Gtk-WARNING **: cannot open display: :0
I'm unable to open any programs unless I close a currently open program (which I assume reduces the number of 'clients') or reboot my computer. On reboot, it runs fine for a few hours again, then starts having this problem again. I have 2 instances of 12.04 installed on my system and they both have this problem. I'm running the 64 bit version of the OS on an AMD Phenom II X6 system w/ 4 gigs of ram. Happy to share any other info about my system if there's hope I can get this fixed! Let me know if anyone has seen this before . . .