I've just upgraded a dev copy of our production site from version 2.3.8 to 2.6.1 in preparation for our production upgrade and have run into some issues.
The upgrade seemed successful, although, the theme stopped working. Note - I added $CFG->theme = "standard"; prior to the upgrade.
I tried changing to a number of different themes with no effect., purged all caches through Moodle (theme and development section) and browser.
I logged out and tried to log back into the site but keep a "Unfortunately, cookies are currently not enabled in your browswer" error:
Any help would be greatly appreciated.