Lr3 was a disaster - I found it kept crashing my mac in 64 bit but limps alomng in 32 bit.
I mentioned on Lightroom forum that I had got 'kernel panic' after it crashed and (eventually) was advised to re-install Osx 10.5.8.
I did Time Machine backup & inserted disc.
Seemed to be ok in initially, but hung on ''importing documents' : it was ' approx time 19 hours and 56 min' overnight.
I pulled the plug & started again, imputting new admin name & passwork (which I wrote down); but now, it keeps saying my password is wrong - I can't even re-install as it wants the password.
I have only one use on (me) with standard priviledges - am at my wits end!