[sunmade]

possibly a RAM isue.

I have 4,5 GB RAM

not sure about the scene size nor poly count.

I have 3 gb Ram, MXCL crashes when rendering with -ml option in resolutions above 800*600.

I should add that -ml works fine here at 1280px res, BUT as stated only after I stop MXCL and relaunch

[beppeg]

http://klausbusse.de/mxc/ M~R calculator by Kabe is very useful for understending if we have enought memory

[zoppo]

it's not only the resolution but the number of different emitters.
i think kabe made some kind of calculator for that. you might want to use the search function.