xymon 4.2.2 problem

Hi,

I'm running xymon 4.2.2 client on an ARM based host, running linux. All is running ok but the memory test. I can run manually vmstat and I get results. I can start the hobbitclient-linux.sh script, and it doesn't give me the vmstat output. When i run manually vmstat with same parameters, I get an output.
Can some one help me, or at least give me a tip to find what's wrong ?

Regards,
Damien