I was having issues at my campus when I scroll content. The browser alternately covers the text, pictures, and buttons with black bars a few lines too early as I scroll. The bars are random as to doing this, as sometimes it is black bars followed by a normal row and then more black bars. They run across the frame (one line at a time). Sometimes it fills the whole frame. I fix the problem by scrolling the content off the screen, and repeat the cycle as needed when the random bars hide content from the top down--a few rows too early--as if to represent them scrolling off the screen.
Version 11.7.700.202 fixed this. The problem must have started in the version just before 11.7.700.202.
However, A few weeks later I let the 11.7.700.224 update install, and it created the problem all over again.
I admit I did not attempt clearing the cache when this started happening. However, it had only been about a day, with limited usage, so this is unlikely the cause unless the cache remains the same between updates.
I uninstalled Adobe Flash player 11.7.700.224, rebooted, and then removed the latest version info from the registry (since it complained about using an older version, and forced me to exit). However, this did not work, so I ran the uninstall that came with 11.7.700.202.
I then installed the appropriate 11.7.700.202 installation executable and 11.7.700.202 ax (or activex) installation from the developer archives, and now the problem is fixed again.
There were issues with some video content with 11.7.700.224 as well, but going back to 11.7.700.202 fixed this too.