Oh dear, same here it seems. Which is annoying because everyone can now play on my server except me!
Perhaps it's something to do with the latest live patch (if there is one?) I know I only patched to live today, so perhaps patcher.exe doesn't work with the latest latest patch? I know that it should work with the June 22 patch (because it worked for my boyfrend).
This is pure speculation, of course! I'll sit here and wait for someone who knows what they're talking about to come along and help, hehe.