Re: "Op generation failed"
I'm being Capt. Obvious, but did you try to delete the stair itself? Or have you tried copying it and placing elsewhere, change the color then place it on top of the one that is there.
Not sure what that error is about. It sounds like the stair is not being recognized as a valid object that has color options. Just a guess though.
If you provide a bit more information, I will take a look at the lot. What is the lot name and who is the creator so I can find it in the Gallery?
Hope this helps.
