why would GLU.gluUnproject return NaN's

[Eternity]

Hey!

under what circumstances whould GLU.gluUnproject cause the results floatBufferto contain NaN's (Not a Number)

ive rewritten the part of my engine that determines the 3D position of the 2D mouse cursor and for some reason my gluUnproject just keeps on giving me NaN and i cant find anything wrong with the arguments i use. maybe im just missing something obvious... if i knew why GLU.gluUnproject would do that il be able to find my problem much easier (i think)

Thnx in Advance!

EDIT: the method itself still returns true so it didn't fail.

[Eternity]

i found my problem. Thnx for reading anyway.

[Fool Running]

So, what did the problem end up being?