Mood: 
Today I spent 2 hours trying to fix an upgrade problem, only to figure out it wasn’t anything to do with our program, but with the credit card program we interface with, which worked fine just by itself. However, when we tried to interface with it, it gave an error.
Two hours! I finally tracked it down to one configuration file that must have gotten corrupted when they made a change required for the update. Solving this problem was like one of those stupid puzzles with the empty spot that you move around until you finally see the picture. My co-workers must have thought I was going to go postal, with all the swearing under my breath!
Breathe, Jim, breathe.