Comment 33 for bug 977804

In my case, with a fully updated ubuntu 12.04 as of today, it happened to me twice... and "many" windows were actually just a couple of Nautilus, one Firefox, one Thunderbird... clicking on the top unity icon (trying to open a new application) froze everything once the dash was displayed, with four windows.
Dual display 1360x768 plus 1280 x 800... (1360x1568), seems that something gets "out of memory"...
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
This is a "production" machine, nothing "bleeding edge" installed.