I checked yesterday and was seated in 10A on UA 945 (FRA-ORD) and had been for weeks. I check in today for tomorrow AM's flight and am in 7D. I called Premier Desk and she checked for a reason but found none. CSR said seat change history was something SHARES didn't show. She thought it might be for crew rest but couldn't confirm. A quick scan of this forum doesn't turn up issues for 10A (unless I missed it)
Any other ideas? Sort of not happy about being in the middle section when I selected my seat week ago.