UPDATE: I went ahead and did something I've never had to do with any mileage accounts -- I added up all the miles shown on my statement to see if the total matched at the end of the year. For 2008, in both accounts, it didn't.

Neither of the 10,000-mile credits appear in our printed statements for the 12 months ending 12/31/08, but when I add up all the miles shown on the statement for the 12 months, it comes up 10,000 miles short of the total appearing at the end of the year. The Continental miles that were mysteriously posted and then deducted appear in the total. And everything tracks forward to today -- nothing missing from the total.

All very strange, but it appears I wasn't shortchanged by the Jan 2008 glitch.