Here's a new bug that I just experienced on the app and website:
All of my miles and segments for flights earlier this week had posted to my account. I went into my account this afternoon to check on a trip I have on Monday and all of the miles and segments from this week had been removed from my account. The reason code that the Delta.com displayed was "Still processing - should complete within 24 hours." Of course, it was showing that message 24 hours after everything had posted and then was removed. Currently on hold with a CSR who is stumped by this as well.