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It appears that my activities prior to June 28, 2010, have been stripped, in one way or another.
It varies depending on whether I had manually changed the Activity Name.
For the activities that are still "Untitled", map and chart data is gone.
For the rides where I had changed Activity Name, the category was mysteriously changed from Cycling to Uncategorized. Elevation Gain disappeared. And the total calories was dropped. And the device type became "unknown".
If I click on Activities and scan through page by page, i can see where Elevation Change has disappeared in some activites, and where Total Calories has disappeared in others.
I have run some test reports and found that now my historical reports are garbage because all of that mess has affected the reports.
This looks like something recent to me. I wonder if this creative data manipulation occurred during the last "sheduled maintenance". (?) Not acceptable. I'm glad that I also loaded my data to Training Center. It looks ok there. I might have to create a new account and reload everything there if this is not corrected by Garmin.