Exactly.

You guys are running an alpha release of Xournal for Diablo.
You guys, if you are not developers, should NOT have the Diablo's Extras Devel repository enabled.

Again, disinstall this version of Xournal, disable/remove the Diablo's extras devel repository and re-install Xournal from maemo.org.
After the installation of the Chinook version of Xournal, disable both the chinook extras repositories that Xournal adds.