I subscribe to 3 different carriers all provide delivery report service. I have 2 Bold 9000 with OS 126.96.36.1998 the D (Delivery report) over the Checkmark is missing so I wouldn't know my text messages delivered or not. The checkmark only tell you it is sent.
I rolled back to 188.8.131.524 with one of the Bold, the small D letter appear over the checkmark. Any other previous versions work just fine in terms of SMS delivery confirmation. After trying with 2 Bold - I don't think there is a mistake during upgrading.