Same problem here too. I upgraded to 1.5 because after a few days of use 1.4 would freeze and I'd have to reinstall.

1.5 vanishes about 30 seconds after it's run on my setup. Nothing exotic here either: unmodified install of XP Pro w/all SPs and updates, Dell Inspiron 2650 w/256 ram and a 1.8 p4.

I was just trying to get into my preferences so I could also post how I have it configured, but now I can't even do anything in the program, it just locks up (kind of like 1.4 was doing, but faster).