I'm experiencing this too after upgrading to Ubuntu 13.10. I was delighted to find this bug report, because I didn't want to have to explain the whole think myself.
I was reading an article in Firefox when I noticed it. I had the article scaled up a knotch, and while scrolling text it would flicker a little as though it was having to re-render a paragraph 5 words at a time (while scrolling). This was happening super quick, but the flickering pattern (I was able to perceive) seemed like I'm describing. As you said, it doesn't happen every time you scroll, but sometimes (after scrolling) you'll stop (oh my, it just did it while I was typing: the "p" in the word "stop" became corrupted) and one or two letters on the entire page become graphically corrupted where you can't make them out (in and of themselves). Like you say, as soon as you hit the "Print Scrn" button the corruption goes away before you can capture a screen shot of it. Also, if you click the page containing the corrupted letter, the corrupted letter goes away. I don't have a camera handy, but it seems the only way to show it exactly what we are talking about is to take a picture of it with an outside device. Actually, I've just done a video capture that shows the corruption. See attachment. ** Attachment added: "out.ogv" https://bugs.launchpad.net/ubuntu/+source/pangox-compat/+bug/1227569/+attachment/3883106/+files/out.ogv -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1227569 Title: individual characters frequently corrupted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pangox-compat/+bug/1227569/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
