Originally posted by Lumae:

Fixed by right clicking on game in library, under local files, where the DLC is listed showing which ones are installed, click on the check box next to the DLCs that are NOT installed so a check will appear, doing this started the DLCs downloading for me.

Thanks. After checking the 3 missing DLCs, I lost all my progress for my downloaded pix and the DLCs still didn't show.. I first had to delete all my downloaded pix in order to get the DLCs to show up. Seems like that might be a bug in the game?