Alt+tab causes my screen to look like a colorfull broken glass

[Anderson Mattjie da Silva]

When I use Alt+tab my screen gets somehow crazy and part of it looks like a purple broken glass, sometimes chances to yellow.Don't know exactly how to describe it.Right now, part of my screen is with a red triangle, a purple retangle and another black and a little smaller retangle.After another Alt+tab, my entire screen becomes covered by two yellow triangle.Then, another Al+tab and it goes to the navigator, without a triangle covereing the screen but in the background, appearing behing the navigator screen.
I was expecting to just change the current application on my screen by using alt+tab as I was used on windows...The problem occurs very very often.And a strange detail, when trying to print, the strange figures go to the background as it is shown in the screen I'm sending attached.

Obs: I use Linux mint 12

[Gwendal LE BIHAN (gwendal-lebihan-dev)]

What graphic card do you yoou have and which driver are you using ?

[Andrew Katz (akatz712)]

This is also happening to me. But I had not connnected it to the alt+tab. I am running an Eee PC 901.

My guess is that this happens when things are getting overloaded in memory, and the person was seeing slugglishness, and tried to change applications in various ways.

[Launchpad Janitor (janitor)]

[Expired for Linux Mint because there has been no activity for 60 days.]