Thanks. :)
The plot thickened last night when I tried to serve the leftovers. More accurately, the gravy thickened.
I reheated the gravy and no amount of heat was going to turn it back into a liquid again. I could have baked it into Meat Muffins, but it didn't want to become gravy no matter what.
I finally heated up some more beef broth and stirred it into the gravy and finally got the congealed gravy back into a liquid again.
The leftovers are gone now, but it was all fun experience for me just like most things in the kitchen usually are.