While building a series of slots, I have been coming across a pink bar in my slot. I turned on all my layers but am unable to see it on the .brd. Bar is not present in symbol. It seems to have no effect on thw board, so , what is it?
It looks to me like you have something defined in your padstack with a different size oval. Maybe antipad, or something like that. I would check your padstack first.
Does the pin have a net name assigned? If so, this may be a thermal connection and you can Show Element on Cline to verify.
Open the Pad in Pad Designer and look at the Drill/Slot Symbol. It's probably that.
Better you to check Thermal relief connections for thru pins (Shape--->Global Dynamic parameters)