Saw some reports that the newest version of RTC is still remains as an active process, despite being shut down.
I looked into it and it was a stupid mistake I made when I fixed the original driver de-initialization issue.
Currently it tries to de-initialize the driver after the app has been commanded to shut down, causing the issue.
I fixed it and sent it to @W1zzard for signing.
It shouldn't cause any issues and you can shut it down manually from the task manager.
Just redownload the app afterwards to get the fixed version, when it comes available.