I'm having problems with decals since I've started working with A8.
First I've faced problem with decal shadows, it looks like they have ZNEAR flag set on them
And this happens with particles as well, they disappear if there is a decal shadow on the background.
Another problem with decal that I've faced, is that they really have ZNEAR flag set on sometimes
One more problem I've faced is this one:
All sprites have proper alpha channel, and it worked flawlessly with A7, so there is nothing wrong with script and sprites as well.
I wonder how can I fix this problems. Waiting for advices.

Do you have a Radeon graphics card?

Nope, but I've faced this problem on both NVIDIA and Radeon cards.

your particles are transparent.
use alpha check material from wiki to solve problem...

Non of my particles, models or decals which you can see on the screens are transparent.

Did you change the camera.clip_far or clip_near. Changing any of those could result in inaccurate zsorting.
BTW, I though decals are only for commercial version and above

They work pretty well with beta version as well, as you can see on the picture
I've changed them to "camera.clip_far = 2000;" and "camera.clip_near = 0;"
It used to work perfect with A7, but I have no idea why it looks like this with A8.

Last pic looks like z-beating
Have you tried to use hit.nx / ny / nz to move the decals 0.1 quants away from the wall towards the player? That works for me.

When I place singe decal, it looks perfect. But when I place more than one and on the same position (as on the pictures) they get messed up.

Some one copied my thread?