I'm trying to setup a codeplex project, but I can't make the $Author$ property for the commit to work. Both $Author$ and $LastChangedBy$ returns "unknown" when committing to CodePlex.
I enabled the property though AnkhSvn in Visual Studio 2008.
Any idea if it's something I can fix myself, or is it a bug with the TFS bridge?
Keyword expansion is actually done by the client, not the server. I'd give it a shot with a different svn client (preferably the official command line one) to see if it works for you there. Don't forget to set your props on the project.
If you're not getting responses for the queries used by the client to get the data used to fill the fields (this will likely take some traces), then I'd suspect an issue with the bridge, bu otherwise I'd guess it's likely a client issue.