[platypus-dev] problem with command-line tool in 4.0

Hi
I've been using Platypus 3.x successfully with a project for some time (thank you for this neat tool), running the command-line via a rake (ruby-make) script.
I just upgraded to 4.0 and the command-line seems to be broken (I installed it via the GUI app Preferences). Whatever I put in, I get the error message: 

"Destination must end with .app"
I've tried with my usual arguments, with the basic script/destination arguments, with the destination with and without the .app suffix.
Actually it comes mushed up with what looks like debugging output, and no new-line is output after the error message: 

Abaddon:~ alex$ platypus build/weft-qda.sh WeftQDA.app
Starting argument parsingDestination must end with .appAbaddon:~ alex$

cheers
alex

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