I had only been using my GWF for about a month before the upgrade, but I too am seeing about a two hundred calorie difference between the display and arm band (the display is higher and consistance with the numbers I showed prior to the upgrade). My step count and activity times don't seem to be affected. I did contact customer service and below is the response I got (alot of BS if you ask me!!
)
"We are currently investigating the situation.
The website runs complex statistical algorithms that take the Armband data and compute your calories. This algorithm also uses the historical data on your account to personalize this calculation even further. If you have a Display you will have seen up to the minute calorie values displayed. The Armband contains a miniaturized set of algorithms that can calculate calories and send them directly to the Display every minute. Because the website servers are many times more powerful than the Armband, small differences can occur in the calories they compute. If you wear the Armband on the left arm, the right way up, then the daily calories shown on the Display and website will match within 5%. The total minutes of physical activity should match closely between the Display and website. The daily step counts will be identical. The "right way up" has the logo closer to your shoulder and the lights closer to your elbow.
Yours in Health,
The BodyMedia Customer Service Team"
The difference I have been seeing between my display and the armband upload is more like 15%!
I urge everyone who is having similar issues to contact Body Media. The more complaints they get the more likely they are to look into the problem. I look forward to hearing more about everyone's experiences and hope to get some sort of resolution soon.