Hi Greenwood,
While I don't have a definitive solution to your problem, there is one matter that was brought to my attention recently that is similar to what you describe. We have found that antivirus software from ESET can cause problems with some Service Center Multipurpose USB devices. While we are still investigating this issue, the only solution that we have confirmed, is to uninstall the ESET software (even disabling the software doesn't stop the issue).
If you don't have ESET software installed, then please let me know and I will have some additional questions to ask. Please let me know if you have any other questions or issues.
Thanks,
Kris