Login Issue after Latest Upgrade

We are havening the same problem here as well.. can anyone help.. I can’t login its saying that the user name and password is incorrect. please try again.

I’ve upgraded a number of my sites (by the way I then un-upgraded and went back to 2.5)
The basics:
You must deactivate all your plugins first!!!!!
Most times your password is wrong after the update.
Go to your mysql database – Click on the “browse” button over “Users”
The new page will show us your info for uses. Your password is encrypted or whatever and looks like goobly gop. Delete this and put in either your original password or a new one. Then click on the fold down button to the left of the password you just entered. Select MD5 This is very important or it won’t work. That’s it …. you should be able to get into your upgraded wordpress

I’m at the same issue. But I didn’t deactivate all the plugins first – as I didn’t on my other installs – which went fine (10 of them). This one though is different. I tried the whole remove the files, add them again, and that didn’t seem to help.