Well, for me the most annoying thing is that I cannot use advaced mode and hit ´back´ becaue it gets stuck on "loading". I use gmail in standard html mode... or I have to hit reload after back everytime. Do you have that problem?
Oh, i know what you refer! Yeah, i've had that before. I've grown used to it, though. I don't press the back button on gmail anymore.
I've digged a bit, and found out that the back button works on ie and firefox.
I also found that the fact that it doesn't work in opera, is related to an option the opera people took, in order to maintain another feature (i believe related somehow to the fast history in opera,but not sure, digg a bit if you'd like to know more).
So, i just hope they'll fix it asap
For now, i'm happy with not having gmail stealing the focus anymore! (i hate apps that do that!