Windows 7: Issues with wrong volume error

I am running Handbrake 0.9.8 on Windows 7 Home Premium 64. This program has been working fine for a couple of months but now as of last night it keeps popping up with:

HandbrakeCLI.exe. Wrong Volume:
The wrong volume is in the drive. Please insert [name of dvd in my drive] into the drive

Now if I just hit "retry" or "cancel" it keeps going but that does me no good as I usually set it to encode and then walk away as it takes a couple of hours to encode a movie. From searching the internet this seems to be a common problem and usually the culprit is the software that is kicking out the error, in this case Handbrake, but I have uninstalled and completely reinstalled the software to no avail.

Any advice on this matter is greatly appreciated. If I can't figure out what is going on my next course of action is completely reinstall windows but I just don't know if this a windows problem or not.

None of the FAQ or help from Handbrake have turned up anything.

Thanks in advance.