I just finished an upgrade from 2.6.2 to 2.7... deactivated all plugins first, deleted wp-admin and wp-includes folders, preserved wp-content folder contents and wp-config (followed instructions, basically). No change, nothing happened, good or bad... it's as if I never upgraded. I used the 2.7 download. I am using wp-cache, but cleared it as well as my browser data/cookies. I ran the upgrade script, and it said there was no need to update the database.
I don't want to try again in case it royally screws up my site. Anyone else have this issue?