I've been having problems with GIMP crashing too, with only minor operations running. I have seen the topic come up over at the GIMP forums, and from what I can tell, it seems to be a fairly common issue with ver. 2.6.6. Several folk have posted, as well as myself. So far the GIMP lords haven't seen fit to address it in any of the threads I saw. Hopefully they have taken note and are taking steps to fix it in 2.6.7. In the meantime, if you can get your hands on 2.6.5, over at sourceforge or somewhere else that hosts it, that might help. Hope so!