I've emailed William.
I successfully merged my SPG and Marriott accounts. I adopted my Marriott number going forward.
None of my stays have posted yet since 18th, at all. I have 10 stays coming up, but my most recent stay in Fiji hasn't posted. Nothing. Zilch. I checked out 7 days ago.
My local SPG Credit Card (Emirates NBD, UAE) hasn't posted any points either to my marriott account - this is despite them posting every month, exactly on the 25th. They are now missing.
I hope this can be resolved - it's frustrating.