I am now facing problems as well...

I should have 6 upcoming reservations with them but only see 4. I wrote to GP about it and they keep telling me my reservations are alright, that they do have my GP number attached to them. But somehow I don't see them.

Only way to see them is by using the retrieve my reservations option. They show up and it says that they don't have my GP number attached to them. Then I click "Add to all". Get to the confirmation page saying that my number has now been appended... but still can't see them under my account...

I just hope I won't forget about them at one point and double book (yes I am a bit light headed sometimes )...

Actually I just checked and they do show up on my PassBook.... ^
But not on the Hyatt app...