Why do I see flashing, "checkerboard" effect in some places in SL?

[Larghum Farigoule]

Why do I see flashing, "checkerboard" effect in some places in SL?

[Peewee Musytari]

What graphics card do you have?

If it is ATI, disable VBO in preferences > graphics > hardware & see if that helps.

[Ishtara Rothschild]

That is definitely a problem with ATI Radeon cards. Some of the checkerboard / star patterns that appear in clouds and on some prims (see screenshot blow) vanished when I disabled the Catalyst A.I. in the video card driver, under "Graphics --> 3D --> All" in the Catalyst Control Center. But I still ran into this graphics bug on occasion.

What finally did the trick was an older version of the the Catalyst driver. Uninstall your old Catalyst version and download version 10.9 from the ATI homepage. You can find it under the "previous drivers" link at the bottom of the download page, after selecting your video card and OS. All newer drivers don't seem to work well with SL.

 

PS: Peewee is right that disabling VBO in the viewer also helps with some visual bugs. It has no effect on this weird pattern, but it prevents polygon borkage like this:

[Peewee Musytari]

I agree...I have drivers fro Aug 2010 now, the latest ones give me starry clouds and the ones before that I get crashes for "Display Driver stopped responding and has recovered". Older drivers seem to work best for me.

[Drongle McMahon]

As cloud artefacts go, that's a bit tame. I think this one in the picture was a strange cache corruption. Had to delete the settings file to get it back. Clearing cahe wasn't enough.:smileysad:

[Ahab Quandry]

I am running an ATI Radeon HD 5850 card and had awful trouble with "stars in the sky" and with "flashing boxes" on my head when underwater. I tried going backwards with older drivers but with no success and in desparation downloaded the latest driver for the card. Bingo! No more "stars" or "boxes" and everything is working perfectly. This with the latest Phoenix viewer (908?) so I don't know if this will help with any other cards or viewers. Best of luck. I hope you find a solution soon.