Try these steps to fix it.
- Launch Dragon Dictate 2.5.2 and go to Tools -> Profiles
- Select your USB Ear-Microphone Profile in case you have multiple User Profiles
- On Audio Sources, take note of the currently active Audio Source, it defaults to "Standard Audio Source." unless you have added a second audio device / source.
- Hit the Plus [+] button to add a new Audio Source
- Set name to "fake audio" or what ever you want to call it.
- Hit Continue to create the User Profile.
- When it get to the Volume Adjustment / Microphone Setup window, close it out.
- Go back to Tools -> Profiles and set the Audio Source back to "Standard Audio Source" (or select the last working audio source)
- Hit Continue to load the Profile
- The USB Ear-Microphone should work after switching to a different audio source.