This may not be relevant to the issue you are experiencing since it is
not Snow Leopard related, but a couple months back, I tried to install
B56a7 on my old Powerbook after having scrubbed the hard drive clean
of the previous Quicksilver installation. B56a7 crashed immediately
upon starting (as you described) as did B56a6 and B56a5. I had To go
back to either B56a4 or B56a3 to get a version that actually started.
I left it at that--- not wanting to fight anymore. However, about two
weeks later, I noticed Quicksilver had updated itself to B56a7. It has
worked fine ever since.
