Troubleshooting (and Avoiding!) Common Problems in ProTools

We all have technical difficulties from time to time, especially when using software as intricate as ProTools.  But, after years of making what seems like every mistake in the book, hanging out on Avid DUC, and stalking Gearslutz.com, I pride myself in my ability to overhear frantic technical freakouts and supply solid advice on the best course of action.