Alright, this sounds like a "driver" support issue in relation to v2.1. I'll e-mail you a link to the bug report I've filed for you.
Is anyone else having success or failure using ThinkEssentials 2.1 with the Intermatic HA22 USB adapter? I haven't heard of any other issues, but of course am concerned "just in case." We updated our software to support native 64-bit mode, but that's the only significant change in that part of the codebase--and it has tested out great here.
Chris