Dual monitors make Unity go blank

[freedryk]

So the first couple of days using Unity with my dual monitors went fine. Today I plugged in my laptop to the second monitor, and while the top bar and the side menu are being displayed, all the desktop icons, background, and actual program windows are black. Basically I just have the menu bar and the launcher. The windows are still there when I unplug the second monitor. Any ideas?

[carcus]

I'm having exactly the same problem, using an Acer Aspire Timeline 3810TZ.
Also, if I run my second monitor in portrait mode, the top third of my laptop's screen is also black, hiding programs and the desktop (though not the menu bar)

The problem is resolved if I log out and log back in again-however logging out is tricky as the shut down menu is hidden behind the black space, so I have to make a guess at where the button is!

Is there any known resolution to this?

[complience]

Same problem I think

second monitor is detected, taskbar and mouse extend into it

But any background or active windows are blacked out

BUMP BUMP

[complience]

Have decovered is caused by a bug in unity it does not actively resize the desktop, requires the users to logout first