no error... no nothing. Also on the garmin connect app., same weight/height input issue...put it in, cycle back a menu, go back to my personal data and it is no longer there.
Weird. Works just fine for me. I go to this page, click the Manual Input button, enter a date and a weight and click OK. Done. I'm guessing if you have a problem it is browser related.
Not sure if this will fix everyone's issue, but I also could not manually input weight. I found that if I went back to my Profile -> Edit Profile -> Personal Information, then make sure you have a base weight added here. Once I added a weight here, I was able to go back and manually input weight into the widget (or whatever you call it), on the dashboard and it would save.