I have two Anker 13 data port hubs.
The first started having problems within the warranty period, so I asked for a replacement.
Since a few of the ports still worked, I decided to keep the old one and split the devices between the two with three external hard drives that I use for backup on the old hub and the rest on the replacement hub.
Seemed to work OK, but now I cannot get either hub to recognize a card reader with an SD card or the same card in my camera plugged into the computer via the hub. I am on an iMac [El Capitan] and routinely use iPhoto to download photos.
I can look at the photos inserting the card into the card slot in the back of the computer.
Even rebooted the iMac. Same story.
At the moment, I have three ExHD on the old hub - working.
And six devices on the new hub. Four ExHD, a printer and a mouse. No problems.
Thank you