As another beta tester, I am not privy to problems other have found.
I've seen and reported an issue with the licensing code and was given a workaround.
I've also seen and reported an issue with attachment filenames containing an apostrophe. Yahoo substitutes the HTML symbolic ' (& # 3 9 ;) in the filename and attachment link. I have a workaround for that, too, I think.
I am not aware of issues the other testers have seen.
I have one more test and I think I can do the final upload of my group. I'll post here when it's done.