Hi, forum. Late '08 MacBook Pro(Yosemite 10.10.2) After updating to Yosemite, I started noticing quite a bit of Youtube videos were blacked out, but audio playing. I've always used Safari, yet tried to change to Chrome to see if that fixed the issue. I thought maybe my GlimmerBlocker was interrupting it, Nope. Also, I read a few threads on some troubleshooting, but no luck. I then went to Safari's Preference menu(extensions), disabled AdBlock, all videos were playing. However, now all the ads play around Youtube and most other sites where I assume they were blocked before(even with GlimmerBlock enabled). Question is: Is there any advice on how to block the ads without blocking some videos? Thanks for any input.