Hi,
It would be interesting to find out if on a different computer your ODAC manifests the same issue, on the same Windows version.
Also, an USB stick with Ubuntu-live and your ODAC connected to might help; if on ALSA or PULSE there will be the same clicks, then ODAC might be defective I'd say.
Btw, what about using ASIO4ALL for a quick test? Maybe it could help. Also, what about using jRiver, do you have the same issue?
Thanks!
P.S.: I have these clicks on my ASUS Essence One DAC when seeking and when start/stop/pause are involved, but not very annoying and only when using ASIO; on WASAPI everything is smooth. Also, when using ASIO and seeking a lot playback locks for about 10 seconds then I get a Foobar error (sort like "your soundcard stops responding") and I need to press play again to make it works again. I really think this is drivers/software related issue, perhaps the same for your ODAC.