[moving Max1311 post here -- JimH]
Don't know if you see this as a showstopper, but Media Center 9.1.249 crashes with a Media Core error, and exits ungracefully, in the following situation:
1. Attach Rio 500 MP3 player via USB.
2. Right click and send MP3 files to Rio device queue. (Right-click menu now has Rio device listed at top as the last action performed.)
3. Upload file to device.
4. Unplug device from system.
5. Right-click any media file in the right pane or folder/playlist in the left pane.
RESULT: Media Center crashes on any right-click action.
EXPECTED: Media Center opens right-click menu normally, whether device is still attached to system or not.
To work around this issue, re-attach the Rio and start Media Center. This stops the right-click crash from happening again, at which point you can choose some other action, which puts it at the top of the list, instead of the "Send to Rio" action. You can now unattach the Rio, and right-clicking will no longer crash the system.
Media Center Registered 9.1.249 -- C:\Program Files\J River\Media Center\