The person who was having the difficulty every time had to switch computers and the new one does not manifest the problem.
The other two that experience the problem only experience it intermittently. I have told the one I am working with to try a different browser if the problem happens again, but don't know when that will be. Both are able to clear the problem by rebooting or getting out of all excel instances. Since it doesn't happen everytime I am not sure when they will expereince the problem again to do testing.
There is one person, using Chrome, that never expereinces the problem. So not sold on it being a chrome problem, but can't rule that out yet.