Thank you for the error report! I've been trying to track down this bug for a while now but couldn't reproduce it on my PCs.
So the level runs *before* you try to edit the player entity?
Can you cut-and-paste the text from your myProj.xml here? The debugout.xml might help as well, but I really want to see your myProj.xml.
Thanks again. This bug is my number one priority.