So i'm working on my map, but sometimes(like with a health droid) I try to put an object down. I can't see the object and (zero editor) stop responding and then crashes.

Are you using custom meshes for any of these objects?

nope

Hmm. Which ODFs does this problem occur with? (Please provide the ODF names.)

so far on these:

tat2_bldg_cantina.odf

tat2_bldg_crashed_spaceship.odf

and probably lots of others that I have not tried yet.