User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/18.0 Firefox/18.0 Build ID: 20121023042010 Steps to reproduce: Open the attached test HTML file. Use a http server (HFS or similar for example) to open it in Frefox. It is important the file is opened using http protocoll NOT the file protocoll. In the line named "!!!!Unfold Me!!!" click the arrow at the far right. An area unfold. Scroll down. You should scrioll at leas 450px. My screen resolution is 1440x900. It is enough for me to scroll half the page to trigger the error. Now scroll up again. Actual results: The displayed page gets scrambled like in the attached screenshot. Expected results: Page should be rendered normally.

If your GPU is NVIDIA, most likely Bug 782311

Correct, it's a Quadro NVS 160M. Probably a duplicate.

Guys which could confirm this issue, I need some more info about your PC specification. Especially: -motherboard and chipset info -GPU working on which PCIe (3.0/2.1/2.0/1.1/1.0) -monitor info (type, resolution, refresh rate, connected with HDMI/DVI/DisplayPort/VGA CPU/memory/sound card/PSU/etc is optional Thank you!