My external drive only shows up if I unplug and re-plug the USB cable. Why?

I'm using a Thermaltake BlacX USB 3.0 doc. My iMac isn't 3.0 compatible so it's defaulting to 2.0. When I drop a drive in the powered-up BlacX, it does not appear on my desktop or the finder. However, if I detach the USB cable and plug it right back in, I get a popup asking if I want to use the drive for Time Machine. After dismissing this popup, the drive appears on both desktop and finder and can be accessed as expected.
Of course, this dock is designed to continually and easily swap drives. As soon as I eject and drop in another - same thing. I hear the drive spool up but there's no sign of it. Unplug and replug the cable, and it pops up.
Any ideas why?

The interesting thing is I'm not using Time Machine presently. If I go to System Prefs and click on Time Machine, the slider is in the Off position. If I type "Time Machine" into the Spotlight and click the icon, I get a popup telling me "You haven't selected a location for Time Machine backups." There is a button to labelled "Set Up."

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