I had been experiencing the much discussed jumbling of text while 2-finger scrolling in safari and the flickering when watching flash videos (youtube, etc.). I had reinstalled Adobe Flash Player 10 but that did not solve my problem. I have an Early 2008 Penryn MBP 2.5ghz with 4gb of RAM. When I took the 4gb ram out and swapped it for the stock 2gb, the issues have gone away. Does this mean that it is a problem with the RAM (I haven't had any other issues, I used the Applecare TechTools to check the ram and it was fine) or could it be a problem with my computer when using the ram. I need to know if I have faulty RAM that I need to replace or if it is an OSX issue with 4gb of RAM. If anybody else has had this problem, can you please post if you are using 2 or 4gb or ram, I have been looking around on other forums about this issue and most of the people talking about it are using 4gb of RAM. Thank you.