Weird display problems..help?

[OryxIsild]

I have a NVIDIA GeForce GT 640 graphics card and I haven't had a problem with SL with it up until recently. Whenever I log out of SL it would give me a black screen with one, thin, coloured line running in a jagged pattern across my screen, then the screen would go black and come back and be fine. I could live with that. 

As of tonight, however, things have changed. Whenever I log out of SL I see stuff like this:

http://imgur.com/J3pgzeb and http://imgur.com/442CQmg

I have to reboot EVERY time in order to get this go away (logging out of Windows 7 doesn't do any good as the weirdness follows me to the log out screen. 

The reason these are cell phone pictures is because when I screen capture the issue, paste it into Paint and save it, then reboot and look at the picture - the screen capture is 100% normal. It doesn't show the weird patterns AT ALL. 

I have tried both Firestorm and the official SL viewer both with the same results. 

I have tried DayZ, Elder Scrolls, Banished, The Sims, Civ5, all full-screen, and none of them give me the issue. 

ONLY SL gives me the issue. 

Does anyone have any idea on what the hell is happening and how to fix it??

[Theresa Tennyson]

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OryxIsild wrote:

I have a NVIDIA GeForce GT 640 graphics card and I haven't had a problem with SL with it up until recently. Whenever I log out of SL it would give me a black screen with one, thin, coloured line running in a jagged pattern across my screen, then the screen would go black and come back and be fine. I could live with that. 

As of tonight, however, things have changed. Whenever I log out of SL I see stuff like this:

http://imgur.com/J3pgzeb

and 

http://imgur.com/442CQmg

I have to reboot EVERY time in order to get this go away (logging out of Windows 7 doesn't do any good as the weirdness follows me to the log out screen. 

The reason these are cell phone pictures is because when I screen capture the issue, paste it into Paint and save it, then reboot and look at the picture - the screen capture is 100% normal. It doesn't show the weird patterns AT ALL. 

I have tried both Firestorm and the official SL viewer both with the same results. 

I have tried DayZ, Elder Scrolls, Banished, The Sims, Civ5, all full-screen, and none of them give me the issue. 

ONLY 

SL gives me the issue. 

Does anyone have any idea on what the hell is happening and how to fix it??

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Do you use "f.lux" or a similar screen color-adjustment program? What you're seeing sounds exactly like this Firestorm JIRA, which would also have the same effect on the LL viewer:

http://jira.phoenixviewer.com/browse/FIRE-12561