problem with commands.getstatusoutput/os.popen and pygtk

[n.o.]

Hi!

Can you please help me with the following problem?

My application calls 

(rval, outp) = commands.getstatusoutput("...") 

inside a pygtk timer.

when i start the application from a terminal window, everything works.
when i use GNOME/"Run application" or a desktop launcher, i get
errorcode 35584 for rval.

i tried the thing with os.popen also - same problem.

thanks in advance,

norbert