Crashing when applying transitions

Hi, I'm running kdenlive on Mac OS X 10.7.3. My problem is that I can't get most of the transitions to work - the only ones that don't cause the program to crash are Affine, Dissolve, Region, Composite and Wipe. I really want to use some of the other transitions, but when I select them (either via the right-click drop down menu or the Transition editor pane) the program crashes. This is very frustrating - any solutions? Could it have something to do with one of the dependencies?