It's a good idea to collect the bugs and other problems in a central place. You might want to add the following to the Wiki:
Search function:
If you're on the home page or a game card the button still opens the quick search field as before. Otherwise it opens
http://www.gog.com/games. It is not intuitive anymore. (Of course it's probably not a bug, just a bad design decision)
Library:
If you try to hide a game in your collection and you click on the label more than twice, the description toggles between "hide movie" and "unhide movie".
Library:
If you have all games hidden (or all except one), newly purchased games are not shown in the library. (old problem, before the design change already)