Yeah, I figured all that out the hard way, but I still don't know what caused it. It was probably just a Bill Gates, you know, one of those inexplicable errors that you are just supposed to accept as the price for having such a neat program. "I'm sorry, but I am confused, and need to reboot." The only thing I was doing was adding some columns on the Nasi sheet for volume and the NMO, but I don't know why that should confuse it and cause it to drop the library link. It seems to be working okay now, but after every Solver optimization run, I save the program and exit Excel completely, since Solver really fills up the memory buffers with numbers *Big Time*, and if I try to do any subsequent editing, the program freezes up...
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