Hope i wont get warned for this, but u guys are always in this zone.

[Alblaka]

Jup, too big sprites will sometimes crash the LF2 engine.
Some people guess it's as well related to the PCs efficiency (bad PC = more crashes).

However, Neocrypt is right, why do you need something as big as 1000 px?
I sometimes use "screencovering" effects, but these are usually 200x700 or similar px and work quite fine.
If you need some really big picture, you will most likely need it as screencover or background texture. Just create smaller pictures and make the responding object opointing itself every x px to cover the entire game area.