i have not encountered any major glitches in upgrading four blogs to wordpress 2.6 but there is this tiny thing that annoyed me a little. after upgrading wasn’t able to log in to the dashboard. it just keeps saying “please log in again.” even though i’ve tried logging in several times already.
the solution i found was that you have to log out of wordpress first. go to the home page and, if you still have your meta section in the sidebar, click on log out. and then log in again with your usual username/password combination.
i think this has something to do with wordpress 2.6 using three cookies instead of the usual one. doing the steps above sort of cleared the previous version’s cookie replacing it with a newer version. i think.