I was coming here to say I have had many issues out of my 64bit version of Opera but not so many with 32.
It would not let me sign in here using Facebook (both versions) it crashed every time.
The more I use it the more buggy it seems. But, I must remember it is indeed a beta and I will not judge Opera for it unless the final is the same.
I trust and adore Opera, it has been my browser of choice for several years and I really hope they do not disappoint me now.
Cheers.