Hmm., I guess I was rejoicing prematurely... I added /dev/shm into fstab: none /dev/shm tmpfs defaults 0 0 recompiled CVS jack (configure finds shm stuff ok) started jack and the same thingy happens: jackd -d alsa -d hw:0 jackd 0.68.0 Copyright 2001-2003 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details key for /tmp/jack/shm/jack-shm-registry is 0x6a0bdb99 cannot create shm segment /jack-shm-registry (No such file or directory) cannot create engine I guess I am back to square one. In addition, I forgot to mention one important issue with my other machine (where Jack works), and that is that it was updated from mdk9.0, while this one was a clean install. After two clean installs on two different machines, I noticed that neither had the shm entry in fstab, which obviously nullifies the possibility that it was a faulty install in the first place. Again, any help is greatly appreciated! Sincerely, Ico