yes, i found the same thing after trying several things ten years later :) comparing "ltrace mpman" and the man of lsusb revealed the path problem in usb file system. of course, i never found your message before resolving the problem myself :(, i had my deal of c code reading and trying to extract the relevant non gui code to another language as the oaf i am. anyway, ln -s did the trick. i put the messge for the archeologists who will try to make an mpman work in 2030 :))))