Unwanted "Smoke" texture being substituted

I didn't know whether to post this to "Design and Textures" or "Scripting", and it could also be considered a "Technical Issue"...

I have a script that is setting many primitive params, but intermittently, when setting the texture, the "Smoke" texture that comes in the default Library is being used instead. There is NO place in the script that I address the "Smoke" texture, either by name or by UUID.

Is this a "default" texture that is used when lag is bad? Or, is there another reason "Smoke" is being used?

Thank you.

"Smoke" is the default texture for a number of purposes, including "show transparent" and pending downloads in some cases.

In one of the current series of First Look viewers, Smoke got broken and all of a sudden all kinds of objects started briefly showing the solid grey default loading texture in brief flashes.

Thanks! That makes sense -- Lex Neva also suggested that if you pass NULL_KEY or an invalid key to llSetPrimitiveParams or llSetTexture, you could end up with "Smoke", so I guess I'll have to see what specifically is happening with the keys.

Since this doesn't seem to be a "Technical" issue, and is more likely a "Scripting" issue, I apologize for cross-posting, and perhaps any further ideas / suggestions could go to the Scripting thread.