[PlanetCCRMA] jackstart hanging the system

[Lucio Ribeiro Gomes]

I just have installed the Planet CCRMA packages and i have a problem
with Jack. When i try to run 'jackstart -R -d alsa -d hw -r 44100' my
CPU and Memory usage goes to 100%. If I don't stop it, the process hangs
everything. Even a 'jackstart -h' do the same! 
There is no problem when I run 'jackd -R -d alsa -d hw -r 44100', but as
a normal user I don't have the realtime priority for Jack. What can be
wrong?
I'm using the kernel provided by PlanetCCRMA (2.4.19-1.ll) with
lowlatency activated, and the alsa drivers running OK. I have a Athlon
1Ghz, 512Mb Ram, Sblive sound card.
Sorry about my poor english! Im from Brazil...