It seems that as usual, SourceForge have not been able to manage their user cron jobs and hence our nightly snapshot job has not run for some considerable time (and we were not notified).
My profound apologies to all who I've directed to the nightly snapshot only to find their problems not resolved. I've now moved the triggering of the snapshot to our own server so we aren't held in thrall by the whim of the SF.net administrators.
I would urge you to use the nightly snapshot as we get closer to a new release as it has important fixes that will ease your frustration and our support load.
The URL is http://dotproject.sourceforge.net/dotproject-stable_2.tar.bz2 (for the version 2 stable branch).
The head branch (if you are feeling adventurous) is http://dotproject.sourceforge.net/dotproject.tar.bz2