Yeah, oddi is right, on Windows it's "subwcrev" which is expected to be part of your PATH, otherwise the SVN revision cannot be determined and will thus not be used / printed.
I'm quite sure i didn't do that at the time, as i have never used TortoiseSVN, but a command line version.
The behaviour i'm 100% positive about was that if i had the correct configuration (file? Path?) at compile time, then i didn't need any change to my standard PATH to have the subversion displayed when launching the exe (i don't know if that's what's both of you mean, or if you only talk about compile time).
Anyway, i'm gonna double check if my SVN folder is on my compile path, and then i'll see if it works again