|Found a bug. This is with the downloaded package for mac os x Leopard (not snow).|
I put a simple box on one layer. I then added a layer and cut the box from the first layer and went to the second layer. Did a paste in place. Inkscape crashes.
Just tried it again with just cut and paste on the same layer.. Still crashes. I get an error message that I assume to be from the OS asking if I want to relaunch. When I do this, I get an Inkscape window that is full of garbage characters and missing icon buttons.