I've been tracking the unstable 1.3 branch for some time. One "bug" I've noticed is that, after I set the margins of a new document to sane values like "0.5 in" (inches), I can no longer edit the values. When I later go to Document Setup to edit the values, the "0.5 in" is replaced with a negative value like "-0.35 in". I can reproduce this behavior every time.