[ubuntu] "Child" windows get lost and/or moved by Unity

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http://ubuntuforums.org – I have managed to lose 'child' windows in Unity a few times. For example, I started composing a new message in Thunderbird (so Thunderbird pops up the child window for composing the new message), and wanted to verify something in Wikipedia, so I clicked on the browser in the launcher (which was running in a different workspace) and it switched to that app/workspace. I completed my search, then clicked on Thunderbird's icon in the launcher to switch back. But nothing happened. I manually went back to the workspace containing Thunderbird, but the 'compose message' window was gone. I f (Hardware)