So reportedly some of the problems for the last week are fixed:
https://forums.garmin.com/showthread.php?345813-MyFitnessPal-down-on-Monday-April-14-2016-%28-%29&p=818810#post818810
and at the moment, GC is finally pulling today's latest values from MFP.
But my calorie consumed values for the past several days remain wildly inaccurate.
It seems that GC never goes back to update earlier days -- so that when a false value gets set (as happened often with the recent troubles/errors synching with MFP) or when GC has decided it's gotten the "final word" on a day's values (even if there are subsequent changes at MFP), there's no way to correct it.
Syncing appears only gets the latest value for "today" ... it doesn't check previous days to correct errors or incomplete results.
And this makes the history and graphs and so forth largely worthless.
Is there some way to correct those past errors and force GC to correct its values based on MFC's history.
Are there any plans to make GC keep checking a day's value for at least 24 hours after a day ends - if not longer - so it can correct this sort of problem in future?