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.

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https://bugs.launchpad.net/bugs/977804

Title:
  Unity crashes when many windows are opened (intel_do_flush_locked
  failed: No space left on device)

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