I just conducted a review of my 2011 point postings and noted a large number (10000+ points) worth of discrepancies, although most of them related to a single property to which I've given less than stellar reviews for CS. Perhaps a good reminder to check your earning history and make sure you're getting everything!
Here's what I sent GP:
May xx: Missing Diamond bonus. Expecting credit of 1000 GP points.
May xx: Missing Diamond bonus. Expecting credit of 1000 GP points.
May xx: Stayed 3 nights, but only credited for 1 night. Also missing Diamond amenity bonus of 1000 points. Expecting credit of 3xxx.
Apr xx: Stayed 4 nights, but only credited for 1 night. Expecting credit of 2xxx.
Apr xx: Missing 1xx points.
Apr xx: Missing 2xx points.
Apr xx: Missing Diamond bonus. Expecting credit of 1000 GP points.
Mar xx: Stayed 2 nights, but only credited for 1 night. Expecting credit of 1xxxx GP points.
Mar xx: Missing Diamond bonus
Feb xx: Missing 1xx points.
Jan xx: Missing Diamond bonus. Expecting credit of 1000 GP points.