SourceForge recently forced their users to change their passwords [1] because of an attack on their infrastructure [2]. Pure speculation but I'm not sure if that had anything to do with this?
Those two SourceForge blog posts are from January 2011, a year before the release of TrueCrypt 7.1a. The recent forced change was due to infrastructure changes.
https://sourceforge.net/blog/forced-password-change/