Hi,I riproduced same behavior of qtiplot 0.9.6.2-1 in Debian Lenny (Xfce desktop). When the CUPS deamon (cupsd) is running, qtiplot process start whitout the GUI. No error messages in console, simply the user interface is not shown. Now, stopping cupsd, all new istances of qtiplot starts without any problems.
cups 1.3.8-1+lenny6 qtiplot 0.9.6.2-1 best regards samuele fanetti (aka borlongioffei) -- linux user #470612 http://lowmemorymode.wordpress.com