Thanks, Andrey. I couldn’t find any popup window. I just left it on overnight and in the morning I found that it had shut it self down and seemed to behave properly when I ran it again.
Since that time, I have had multiple instances of Tonfotos hanging. If I wait long enough, it usually becomes functional, but if not, I kill it with Task Manager or Process Explorer, wait a bit and restart it. It seems to reset itself reasonably well.
I suspect my problems are related to having added a bunch of content on a NAS that is slower than the local drive where I have most of my prior content, and perhaps I am getting too much in a hurry, and overwhelming something in the software processes.
