I'm having this very same problem with 2.8.6 Pro on my XP Home system all the time now and never in the past but I've been away from it several months. What is going on and where is the fix for it? I see complaints for many months back and no fix. I think this one has the developers stumped.
I wall not pay again for something that is failing and needs so much attention. I wait in line for hours to have it fail and have to start over.