Thank you.  I ended up calling support and this is exactly what they had me do.  

I had it happen again that day and realized what was causing it to happen.  I was in back-to-back appointments for a few hours and my computer went to sleep.  This is a new workstation machine and the settings put it into sleep mode after a couple hours which caused the display to disappear.  I changed the sleep setting to Never and haven't had the problem since.  Chris, the tech that helped me said it can happen if there's a power issue with a monitor.

BTW - Chris was one of the best support experiences I've had in the 20+ years I've worked with Lacerte.  I wasn't on hold for more than 2 minutes and he solved it within a few minutes.