It is
possible that this is caused by an Anti-Virus application, but I'm pretty skeptical.
This error is being thrown, not by any JRiver application, but by Windows in response to a disk scan being done by
madVR. MadVR is a third-party rendering plugin used for Red October HQ playback. Errors just like this one are almost always caused by removable disk drives (like camera card readers) that have no media present. This page may help you to solve it:
http://www.sleeter.com/blog/2013/08/fixing-the-there-is-no-disk-in-the-drive-error/If you are using a camera card reader on your computer, that often doesn't have media loaded, and you are getting these kinds of errors, USBDLM may help you to resolve them. USBDLM will allow camera card readers (and other similar "disk drives") to only show a drive letter in Windows when there is a card actually inserted (and otherwise disables them). It is a very handy, and free, tool for Windows:
http://www.uwe-sieber.de/usbdlm_e.htmlYou could also report the error to madshi on his madVR support thread over at Doom9:
http://forum.doom9.org/showthread.php?t=146228or check his bug tracker for possible clues or resolutions:
http://madvr.bugs.madshi.net/If you've done any custom configuration to MC's madVR setup, you may want to reset it as well. This can be done by running the
restore default settings.bat file found in:
C:\Users\<USERNAME>\AppData\Roaming\J River\Media Center 20\Plugins\madvr