I installed and ran Witcher 3 GOTY recently and was greeted with an "insert disc" message when I went to play it. I pressed "ignore" a coupe of times and it ran ok (at least for an hour so while I tried it out). This happens each time I run it though.

I was a GOG key from a giveaway (Zeogold and Doc0075 - Thank you), so I would expect it to have been purchased through GOG not a reseller.

I can get it to run ok, but I am curious, and a little nervous at any unexpected behaviour like this. Anyone have an idea what is happening and how to solve it?