I thought I had .396 installed , but it was .377. Since updating to .396 I haven't experienced any YouTube problems. I have a 6 year old Sony VAIO Desktop with Windows XP, 1 GB RAM, and Pentium 4, 2.40 GHz. I run Avast Free 5.0 with OA++ and have Web Shields activated in both programs and Behavior Shield in Avast running. Every once in a while I see a slight lag when browsing with other tabs open and YouTube Video playing, but I would think this is normal with all shields running.