India, April 23 -- The American Express Platinum Card is often seen as the crown jewel of travel rewards cards. With a hefty $695 annual fee, it's packed with benefits that can easily offset the cost with complimentary Hilton Honors Gold status.

But recently, something unusual happened as some cardholders noticed that the Hilton benefit had suddenly disappeared.

American Express offers several versions of its Platinum Card: the standard version, the Morgan Stanley Platinum Card, and the Charles Schwab Platinum Card.

Now, a glitch appears to have specifically affected holders of the Schwab version, causing the Hilton Honours Gold status benefit to vanish from the benefits page-and worse, downgrading users' Hilton Honours accounts from G...