PLEASE READ THE EDIT AT THE BOTTOM OF THIS POST BEFORE YOU REQUEST A RESCAN.Got some games that didn't show up when you registered?
Post here and we'll do a full rescan on your account!
Edit: As of April 10th, 2018 Steam has changed their Privacy Policy which may be affecting our ability to scan you. The details of this change and instructions on how to change your settings accordingly can be found here:
Valve's Changes to Privacy Policy Affect Our Ability To Scan Your GamesNavigate to the Privacy Settings page on Steam and change the “Game details” option to “Public”. By default, this will have been set to “Friends Only”. Make sure the tickbox for “Always keep my total playtime private even if users can see my game details” remains unchecked.