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[ubuntu] [10.10] Unity 2D Suddenly dissappeared?

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http://ubuntuforums.org – This has happened, allegedly, twice now, i've been working on photoshop under wine, and the unity 2D interface suddenly just dissappears, when i log out, everything closes, but it just stays on a screen with my wallpaper showing. i had to force a shutdown both times, which i didn't like it's only just started happening now i haven't changed anything Ubuntu wise. installed a few safe things here and there. what's up with the interface, and how can I stop/prevent it from occuring? Spec: CPU: AMD phenom IIX2 55, 3.1Ghz GPU: AMD Radeon HD 4550 512Mb RAM:3GB HDD: 160GB Hitachi (Hardware)