These regular crashes were an issue in the earlier phases of porting of Xournal 0.4.1, as documented in the related thread in these forums.
It was quite a "nominalistic" problem, as there were two parameters which were to have the same value in order to let the program run undisturbed, but when they were different the program was silently axed by the system.
Might be something similar? Just my 2 cents...