This helps, thanks. From what you've described, it sounds like the calibrator creates a profile (for the monitor) that interpolates the document profile, so that what's in the document displays corectly, is that roughly correct? I regularly calibrate my monitor, using SpectraView software that was supplied with it. I assume I'm doing what I need to do to ensure accuracy.
If that's the NEC Spectraview software, that's usually very reliable and trouble-free. Once it's up and running and it has made the measurement and written the profile, everything is handled automatically. There's nothing you need to do.
I'm guessing you just saw a random glitch where the operating system for some reason didn't load the monitor profile correctly. That substitutes the default Windows monitor profile (sRGB).
If it doesn't happen again, and it probably won't, it's nothing to worry about.