Problem using tomograph

Hi, I`m trying to use tomograph for a query analysis. But unlike stethoscope it doesn`t work. I start the tomogroph with tomograph -u monetdb -d exomate, just like in the tutorial. After that I start a mclient with mclient -u monetdb -d exomate and execute the query. But tomograph triggers no output until I quit it with CTRL+C and when I try to gnuplot the file file, I only get errors because there is no valuable data. Could you maybe tell me what I am doing wrong? I`m using MonetDB 11.19.15. Regards, Martin