Top Loading Transport Question

I've had that happen and found it correlates with the kind of markings/decoration on the top of the disc (a lot of paint, etc.)..other than the annoying sound, there were no ill effects.
The pioneer stable platter avoids the effect altogether I believe, since the disc is placed upside down.

I have one cd (unfortunately a favorite) that makes a scuffing sound in both a portable cd player and a Parasound CBT2000. It plays ok and does not seem to damage anything so I have not worried much about it.