I’m having the exact same problem.
I’m new to wordpress.org but I somehow installed 2.7.1 originally.
Now, when I try to upgrade to 2.8.4 on my dashboard I get nada, nothing happens. It says its installing, and then it sits there and does absolutely nothing. I’ve installed the files in the FTP, upgrades, section to see if that worked also.
I’ve got no idea what to try next.
Hello, I’m getting the same message when I tried to activate a whole slew of plugins together. Now, I can’t get onto the site or anything.