Basicly if you crash in the midlle of the update process - you get normal version of dayz with files of experimental build
Easier way to reproduce is just to copy some files from experimental to normal.
BE ignores us ( i'm not the only one with this problem ) - i asked a friend of mine to do repro.
If need additional info or repro - contact me via email in my feedback profile.
experimental and normal version prior 22 april. Can't test in current for obvious reason.