We had a contributor here by the name of "Plastic" with whom I shared some interaction soon after I arrived.
Although he was not as "engaging" as some posters he was a principled, and occasionally very helpful guy, and supremely clever.
He isn't responding to a P.M. from me any more and has not for a long time, but he wasn't the "upsettable" type, so I don't think it's me...
I don;t think he has posted for a while either, but I do find this UI difficult, so I might be wrong in that.
Does anyone else here know that poster and what might have happened to him?