Reply from the manufacturer:
Thank you for leaving us the review and sharing your experience with our product. As far as we know, the compatibility for mac with USB is poor and Apple has released a patch to fix it. We suggest you download the latest patch on Apple website and try our hub again to see if it will help. Please just contact us via email@example.com (better with your order # and review) so that we can assist you further. Thanks again!
CEO of Uspeed