Happens to me too,
On two different computers 32 bit and 64 bit both,
Happens when selecting pen-drives too, I think it has the problem when
selecting devices with defined partitions.
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Disk management maximize problems
https://bugs.launchpad.net/bugs/568907
You received this bug notification
*** This bug is a duplicate of bug 102309 ***
https://bugs.launchpad.net/bugs/102309
First I stop using the desktop effects. (Unticked them both)
Then I reopened the desktop effects window.
Right Clicked on the workspace window on bottom left corner of the desktop.
Clicked Preferences and