xyem: Could anyone who owns The Witcher 2 on GOG please check that it is still on their account? Mine has gone missing..
(I have manually searched too, the only matches for "witch" are The Witcher, as shown in the screenshot, and "Twitch" at the bottom).
EDIT: Also, some external evidence I owned it,
It's on my GOG Wiki page.
That's what you get for arguing with the GOG staff! No more Witcher 2 for you, mister!
Mine is still there, did you try the account refresh?
EDIT: Also, have you tried it in the "big icon mode"? I recall at least the search function sometimes worked erratically in the list mode, I don't know if it has been fixed since then. That's the only reason I nowadays always use the big icon mode, otherwise I like the list mode.
EDIT 2: Well, it lists it also in list mode for me (using witch as the search string), so maybe it works nowadays... I recall I used to have filtering problems in the list mode, while in the icon mode everything was fine.