missing grain table in 2.0

BeerSmith 2.0 forgot that I had registered, after I had used it okay for a few days.  I put in the activation key for a second time, but now there is no grain table (hops and yeast tables are okay).  There is a Grain.bsmx in C:\Program Files\BeerSmith2 and it opens okay if I double-click on it.

How do I get this to work?

Any idea why the activation was forgotten?

Thanks

Thanks, Brad, for showing how to fix this!

If anyone else runs across this or a similar problem, here's what Brad told me (reworded slightly):

1. Close BeerSmith first.

2.  Copy the Grain.bsmx from the Program Files/Beersmith2 directory to your Documents/BeerSmith2 directory and it will overwrite the bad one there. 

3.  Restart Beersmith.

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My machine has been having some BSOD issues where it freezes up and then generates a "blue screen of death."  That or something similar might have corrupted the file.