Fun with Subversion on Windows

Windows isn't case-sensitive when it comes to filenames. The Subversion Repository, however, is. If you add a file called "FILE.cs" and then replace it with a later copy, but called "File.cs", you'll get two files in the Repository. However, if you try and do an SVN Update on a different machine you'll get an error.

The solution is to go into the Repository Browser, delete both FILE.cs and File.cs, and then re-add your updated file.