This is nothing to do with the actual game, but does anybody else have a weird gap in their game library (under the manual ordering) where the Beta game used to reside? I've attached a small image file to show what I mean. I have pushed the games around it and shoved the 'gap' to the end but it keeps coming back.

Maybe a bug? That gap should be in the lower right corner when you have an impair number of games.
At least that is for me.
I wouldn´t mind very much if you don´t miss any game ^^

Yep, it's a known bug.
http://www.gog.com/forum/general/the_witcher_adventure_game_online_beta_removal_and_library
http://www.gog.com/forum/general/empty_space_on_the_shelf
http://www.gog.com/forum/general/gap_on_my_shelf