Today I upgraded this blog to the latest and greatest version of BlogEngine.NET. Not entirely smooth sailing, so here are my notes for others (and the next time I have to do it):
The IsCommentsEnabled property BlogEngine.Core.Post has changed to HasCommentsEnabled. Not sure why this was worth changing but easy enough to fix.
BlogSettings.Instance.StorageLocation doesn't exist any more. After some digging it turns out that you need to use Blog.CurrentInstance.StorageLocation instead.
WidgetBase and WidgetEditBase in a couple of custom widgets complained that the type or namespace could not be found. This is fixed by adding a using statement for App_Code.Controls.
Getting the blog running locally was as usual only half the hassle. The next step is deploying to my hosting provider, Server Intellect. Things always start going wrong at this point. Luckily Server Intellect has some really great support staff and they respond quickly even on a Saturday night.
The first problem is that my backups were broken. Backups always succeed, restores always fail. After restoring my App_Data folder the last month of posts were missing. After digging for a bit it turned out that recent files were invisible over FTP but present in the control panel for the domain. My server had been migrated and some sort of permissions issue had broken access to new files. Not specifically a BlogEngine.net issue, but took a while to figure out and then for Server Intellect to fix.
Once the files were all there I uploaded and the blog itself was working fine, but the admin pages were screwy. It turns out that my server doesn't have ASP.NET MVC 3 installed. Server Intellect offered to migrate the server, but instead I copied System.Web.Mvc.dll to the Bin folder after finding a post on MVC 3 deployment from Scott Hanselman. I also needed to add a MIME type for .cshtml (text/html). With this in place the fancy new admin pages are up and running.
Updated again, 2012-03-11:
Another namespace issue, ExtensionSettings in an extension doesn't resolve any more. Need to add a using statement for BlogEngine.Core.Web.Extensions. There are also some changes required to make an extension support multiple blogs.