This can be due to the older firmware in the dock. When the dock first connects to the PC, the firmware will be updated to a newer version to match the software on the PC. This updated firmware can fix USB 3.0 compatibility issues aswell as connect/disconnect issues.
Connecting the dock to a USB 2.0 first should allow the dock to update the firmware (as USB 2.0 is more mature and reliable). Once the firmware is updated (you'll see a message pop up to say the firmware is being updated), it should be possible to connect it to the USB 3.0 ports.
Wim
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