Disappearing effects

Well I am still perfecting my missiles and bombs during my spare time. However, I have recently discovered a problem with the smoke system. Some of the missiles fx only shows up for a second or two and then disappeared in some aircrafts but works very well in the others.
I have eliminate all the smoke effects for the afterburners but the problem still presist. It is especially pronounce in the Sukoi flankers. All the American and European fighters work fine. I use the Bear Studios and Alphasim models for the Sukoi
Anybody knows what is happening and how to fix it.

I have eliminate all the smoke effects for the afterburners but the problem still presist. It is especially pronounce in the Sukoi flankers. All the American and European fighters work fine. I use the Bear Studios and Alphasim models for the Sukoi
Anybody knows what is happening and how to fix it.

