[Pharo-dev] Monticello deleting all code

I've discovered a strange effect. I don't know why it happened but I want to save a modified package to a repository but looking at the "changed" in monticello it showed every class and method has been deleted. That is not true because the code is still there. Saving the package indeed removed everything for the monticello package. So my image was fine but loading the new package again removed all the code. Any ideas what might have gone wrong here? Or any ideas for a recheck of changes? Norbert