Last night I upgraded from 2.6.0 to the trunk version (r762). Everything went fine. The database update said everything was ok. However, when I created or editted a post, I got an Application Error. So I've gone back to the development environment to see the error message in full: "MySQL Error: Unknown column 'resources.article_id' ...."

It appears to be caused from the /app/views/admin/content/show.rhtml file.

So on the IRC channel, Lanfeust21 said to add article_id manually to the resources table. The field didn't exist. Once I added it, everything seems to be working fine so far.