Not sure if this has been mentioned further upthread, but I just got off the phone with a customer service representative to ask about the missing spend on both my MR and SPG accounts in addition to the now 12 nights missing from my SPG total. She said that presently, call centers have limited access to member accounts and that those particular issues are known, that the internal teams are working on them and that Marriott has an aim to resolve all of those issues in the next 48 to 72 hours. So hopefully, by Friday, all should be well across our accounts.
Also: even if either/both accounts have discrepancies in them, she told me that it's fine to combine now and that whatever data we can't see on our screens right now exists in Marriott's systems and will be added within the next 48 to 72 hours regardless of account combination or not.
Hope this helps. Looking forward to this whole debacle coming to a smooth, unified ending ASAP.
khabah