Yay, i fixed the loggin into my youtube account problem earlier today, it was a clash with my email, i hadn't merged my gmail and youtube accounts...once i did that, BAM!! It logged into my account.
The only problem now is as sum1 mentioned earlier, sum vids buffer every few secs and pausing stops the buffering so u cant even wait for it to load to enjoy the whole vid, the only option wud b to dl and then play...