Thanks PGleo86 for your reply, it's interesting to hear how the Opera experience is with others and to know I'm not the only one with weird problems.
I was using Firefox when going on Facebook lately due to the issue but recently decided to try it again with Opera 11.64 and am happy to report that it fixed itself. I have no idea what happened!? As for the issues regarding youtube not going fullscreen, I had that in Opera 11.62 but going to 11.64 that has disappeared. No slow downs for me in either version. Once they bring out 12 with the new hardware acceleration I'm hoping some of the speed issues people experience will go away entirely. Oh and I always keep forgetting about the site preferences, thanks for reminding me!
Maybe give 11.64 a try now PGleo86 and see if it's "magically" fixed itself.
Intel Core2Duo 6300 (stock) and DP965LT, 2GB DDR2 667MHz, ATI HD5770 1GB GDDR5, WinXP Pro 32-bit