thanx a lot Emmanuel, ive found a versión of my file that contains an 90% of my work, so its a win!.

about your question, i remember that sometimes the java took 100% of my ram, and it became very slow while saving my file. but i didnt know the zipsaving option. and i used heavy textures. so, i dunno if there was a bug. i think it was because my file was quite big (+50mgs).

thanx a lot anyways. peace