Which driver did you install for the Tascam, and have you updated the firmware? A new Windows driver (version 2.05) was released last month, and there have been some firmware updates:
Product: US-122MKII | TASCAM
Edit: From the manual, it looks like there's a screen you can pull up in the Control Panel that shows the firmware and driver versions. Can you post a screenshot of that?
That's exactly the version I have installed.
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