hi,
i went from 5.01 to 5.12 but after successful database upgrade, i get this error:
Cannot find column 'blogs' for class 'MT::Blog'
i think it is related to the pugin "sort categories" : http://plugins.movabletype.org/sort-categories-and-folders/ because in the .pl file i see instances to 'MT::Blog'
i removed it from plugin dir in mt-static and cgi-bin, restored mydql db from dump file, and restarted the upgrade but i get the same error. How do i disable a plugin from mysql to make sure it doesn't conflict with upgrade?
thanks
Reported on Movable Type 5

Vito,
If you've used "Sort Categories" plugin developped by Hajime Fujimoto, your templates must have "sort_method="FooBar" tags to sort categories.
This template tags can only be used with that plugin, so you have to modify those templates.
With MT5.1, you can sort categories and folders by default, so Hajime have declared he will stop upgrading this plugin on his weblog.
To sort your categories, please check this page and try new attributes.
http://www.movabletype.org/documentation/appendices/tags/subcategories.html
Thank you.
I'd like to modify my comment.
"sort_method="FooBar"
=>
"sort_method="SortCatFld::Sort"
I face the same problem. But it has nothing to do with plugins (the same error occurs when they are all removed), it manifests itself with all user accounts right after login, except for the system administrator account.
I finally managed to find a workaround and fix the problem on my installation. It has really nothing to do with plugins, but an issue with author metadata. See the following bug report for an explanation and fix: https://movabletype.fogbugz.com/default.asp?106376
dear all,
i never went through the update then. I was quite confused about what to do. My server has been compromised a few days ago. I know it's my fault since i was running 5.01 version which is exploitable. I kindly ask if someone is patient enough yo help me upgrade and avoid the "Cannot find column 'blogs' for class 'MT::Blog'" bug.
Thanks in advance