When I open my Priority Club Rewards account to check my reservations it often happens that when clicking one of the reservations I receive the following message:
The reservation cannot be viewed via the Internet. Please call the hotel directly or your nearest reservation office.
This often happens when the hotel has modified the reservation.

Now I have found the solution to this problem!

http://mobile.priorityclub.com

Just log into your account on this site and have all the reservations displayed. If there is more than one section under one reservation number it means that the reservation has been modified where every additional section stands for another change.

But the here is the chief attraction: When you click a reservation number on this website you will always see the up-to-date room type assignment and other interesting information. No need any longer to "call the hotel directly or your nearest reservation office."

(Sometimes it can be very interesting to track the room-type-hopping happening after having made a reservation... )