DOUBLESKY in ZDOOM!

[Tormentor667]

I want to insert a doublesky in my level but because of a bug, it won't work :-(
INFO:
The skys have the seize 256 X 128
The Mapinfo makes teh sky:
doublesky
nostretchskytexture (?) --> The sky won't be stretched!
and the skys move!

But when I try to look "downer" then the original Doom view, when I have a sky in front of me, ZDOOM crashes without an "ERROR"!
I tried to change the sky's seize to 256 X 254 but that seems not to be the reason, why the sky doesn't work! Please! I need help!
If you want to have the level and the skys to take a look at it, please mail me... tormentor667@gmx.de
or post a entry to tis forum!!!