IMac doesn't "see" USB Flash drive on initial insertion

Hi,
I have a new iMac running Mavericks with a powered SIIG external USB hub. (Rear USB port design on iMac is inconvenient).
Problem: When I insert a NTFS-formatted USB Flash drive into the hub, the light blinks as expected, but the iMac doesn't "see" it and it doesn't show up in "Devices".
When I remove and re-insert the USB drive, the iMac then "sees" it just fine and it shows up in "Devices"
Seeing this consistently.
Any ideas what might be happening here?
I also have Paragon NTFS installed to enable read/write to external NTFS drives.
Thanks.

I've tried 2 Anker 10 port hubs with my brand new iMac 27" Retina. No storage device is recognized when connected via the hub. The same storage devices are recognized when I plug directly into my iMac. So there seems to be an issue from the iMac to the hub.

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IMac doesn't "see" USB Flash drive on initial insertion

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