The Collection Manager has been modified to coincide with Andreas' recent reorgnization of the museum. You may notice that your collection items have shifted sections as a result.
Also, all TP Museum items used in collections will now either appear in their actual TP Museum section, or within a custom section of the user's creation. This affects a few people who, for example, moved this book
on solving the 4x4x4 into the 4x4x4 section of their collection. So while you can't put a Book into the 4x4x4 section anymore (only Books will appear as an option on the drop down for that item), you CAN still create a new custom section in your collection (you can even call it "4x4x4" if you want) and put anything you want in it.
Sorry if this change has affected the display of your collection, but look on the bright side... now you have an excuse to go and play around with your puzzles some more.