Solved: I was told at Bestbuy that this WNDA3100v3 wireless adapter would work for both PC and my Macbook Pro. It did okay on the PC but.

Since the recent update 6 weeks to 2 months ago, my laptop (MacBook Air) no longer recognizes my dongle (this is not the corded battery recharger). I had no issues with this until the exact moment I finished the update. I have two USB ports on my laptop. This dongle has resided in the same port for almost a year, but I went ahead and tried it in the other port just to see if it would work there. I've removed the Fitbit Connect software, reloaded it, turned off my Fitbit One, all with no success. I don't have the time to continually look for ways to get this to work, especially when it wasn't broken before the update. I'm frustrated.
I might venture to say it's defective, but since it stopped working as soon as the update was complete, I can't be convinced of that. Does anyone have any other suggestions?
Moderator edit: updated subject for clarity. Hi - I understand your frustration. It's always disappointing when things don't work as expected. Both my wife and I have MacBook pros and One trackers and have no issues. So if you're willing, we can try some troubleshooting and see if we can get the sync functionality going again.

I don't know if the update you are referring to relates to Fitbit Connect, a Device Update, or an OS X update. The latter is what I would check first. I am running the latest version of OS X Yosemite. What version are you on? It may also be that your phone's BT signal is blocking the Mac/Dongle wireless link - try turning off the BT signal on the phone and see what happens. I have seen posts in other threads where this was indeed the issue for them.
Aside from the sync functionality, does your One appear to be tracking your steps correctly? Have you tried to sync with another computer, someone else at work for example who also has a One and a dongle in a port? Your One can sync with anyone else's dongle, as long as you're within 15 feet or so of an active (powered) fitbit One dongle. If you could do this, then perhaps this would narrow down the issue to a defective dongle, or a defective port. It would help. Hope this helps.