[Fedora-music-list] X and OpenOffice.org lockups with Jack limits.conf changes

Hello, I have downloaded Jack from Extras (for FC5) and made the changes to /etc/security/limits.conf as described in the README.fedora file. kms - rtprio 20 kms - memlock 256000 (I am not confident that I have chosen the correct value for memlock, I have 1Gb RAM in this system). All was good and my music making was progressing well until I ran OpenOffice.org to update a spreadsheet. Repeatedly my entire display would lockup requiring a login over the network and the killing of X (or dropping to runlevel 3 and then back to 5). Reversing the changes to limits.conf allowed me to login and run OpenOffice.org without any problems. Hardware is a ATI Technologies Inc RV370 [Radeon X300SE] running only standard FC5 Radeon X drivers (xorg-x11-drv-ati-6.5.8.0-1) and kernel 2.6.17-1.2157_FC5smp. Has anyone else seen this? Any suggestions for debugging? Thanks, Keith.