I have upgraded from 2.6 today and am now unable to view the admin - even the login will not come up. The front end of the site is working fine. I uploaded everything in the 2.7 package except for the wp-content directory and have re-tried this several times, even deleted everything from the server and re-downloaded the WP package. The first time I accessed the admin, it did perform the database upgrade, and now confirms that this is done, but now the browser churns for a good 10 minutes trying to access the login screen, at which point it just gives up- no errors or anything. Anyone having this issue?