Yup, I mean, there's no way to work with this editor, at least on my computer. It keeps crashing when I load many levels or packages, even if I unload the ones I've used before opening others. The last time it crashed I was closing my map to open another one, and after crashing, the editor saved the map I was opening OVER the map I was closing, so I lost my work. It's just too unstable to work with.
I've got a P4 HT @ 3200MHz, 3 gigs of RAM and a 256 meg Geforce 7600GT. The game runs very well, but is this not enough for editing?