To expand on what the previous poster said:

It looks like the Autobuilder system that maemo.org has been updated to use the 1.2 SDK which has caused some incompatibilities for some applications (Maepad is one other I noticed), given that pretty much everyone still has Fremantle 1.1.x on their N900's. Hopefully this means that the 1.2 update for the N900 is coming out real soon...