AutoCAD won't render

I'm having some difficulty with a new issue that is occuring:

I have a 3D model that I'm attempting to render. It has rendered recently with no issues. Now, this morning, I get the following error message:

Unable to create output file - Make sure destination directory is writable and that the disk is not full. Rendering aborted.

What?! The drive is only approx. 30% full.

I've closed/reopened the file to no avail.

Also, I've closed/restarted ACAD.

It always seems that AutoCAD acts goofy whenever I have a deadline.........

Very frustrating. :(

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