Well it was nice while it lasted but it seems to have reverted back.
You guys are still having trouble even though you've once again "tossed your cookies", as it were.
FWIW, many of the problems mentioned above have been plaguing me ever since the upgrade a couple of months ago, and I am using a Mac. I have not, however, had trouble with the "Mark all forums as read and return to index" button, which I now have to rely upon as the only way I can keep track of what I've read and what I haven't.
For me the old before-the-upgrade behavior returned and has stayed returned.
For me that has other annoyances, but I currently have other, higher priorities than lobbying to change the way the software handles its database.