Problem Prevention:
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1) Do not use multiple Schematics in the same project! When
   you are simulating, Foundation will build netlists for both
   files. If your schematics have even one net name which is 
   the same, then the simulator will see a confilict between
   them.
2) Use the Symbol wizard to make your symbols, and follow the
   instructions in the Xilinx Foundation Tutorial.
3) When creating a symbol, do not name the symbol with the same
   name as your project!
4) Make backups using File -> Archive regularily!


Solutions to Problems:
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