I've had this problems a few times before but you do have to be vigilant. Sometimes hotels fairly recently converted to the Marriott Brand do not use Marriott anywhere in their posting to your MR Chase credit card. This turned out to be true of the Boscolo Venice. It was listed on my credit card statement as "Grand Hotel dei Dogi" and I did not get 5x the points I should have. This was quickly resolved when I called Chase MR, but you really have to check closely.