This issue has resurfaced and the previous remedy no longer works without doing the following:
Be sure and obtain all QB updates. I then did a Rebuild of Data. I then went to the Windows "tab" (menu option) within QB and made sure to close All open Windows within QB. As it turns out, QB is opening either a default set of QB windows or a previous set of QB windows. Now maximize QB with no QB windows open. Close out of QB then re-open the QB application. This should cure the issue of QB failing to open full screen