Greetings, I've just set up my music rig. I get much of the Linux Midi and audio software up and running using FC 1 and PlanetCCRMA, but I see some strange errors for a few programs. QJackCtl, QSynth, Muse, and Hydrogen give a simple and fatal "Illegal instruction" message when invoked on the command line as a simple user or as root. Jack-Rack gives a segmentation fault. Any thoughts? Some of the programs that seem to work fine are: Aeolus, Ardour, Audacity, Alsa-Patch-Bay, ZynAddSubFX, GMorgan, Rosegarden, FreqTweak. I can run KDE or Gnome on my system just fine, and Alsa and jackd work just fine. All the Alsa modules for midi and audio appear to be loading properly. Audio for both my RME HDSP card and the integrated AC97 work fine. I plug my Roland A-37 midi keyboard into an HDSP multiface. My system is as follows: Fedora Core 1 PlanetCCRMA SMP kernel Dual Xeon 3.06 GHz 1MB L3 Cache Iwill DP533-S motherboard 2GB PC2100 Samsung RAM ATI Radeon 9700 Pro Graphics Card Intel AC97 integrated audio RME HDSP + Multiface Thanks, Neil