I've been using a Forerunner 305 and FR60 for some time now and I have always used Connect to record my runs. I recently got a Vivofit but, having run yesterday and uploaded the data from both devices, I can only see the Vivofit data on Connect for Android. Has the Vivofit overwritten the forerunner information? If not, how can I access the FR data?
I read today that if you wear a heartrate monitor with your Vivofit it starts tracking as an 'activity' when it recognises the heartrate and starts to log it. I would suggest that you don't wear your vivofit when you go for a run especially if you wear a heartrate monitor. I guess that when both your Forerunner and your Vivofit together on your run it registers the same activity twice and take the vivofit as the correct version as it treats it as a duplication?