is this a bug?

I have a particle system with some pointsprites, and some times when i load up the sprites will only render when they float over a piece of geometry,

some times when i load up it will render everywhere,

the same thing happens with the blending trancparency on objects, some times when i load up it will just turn the objects black
and others it will show it as normal

right now i cant get the particle system to render everywhere again,…

the second image i turned on “write depth values” to show you where they sprites should be…
any ideas?

thanks

Can you email me a sample file at support@derivativeinc.com and I’ll look into it?