I now have it in Elements 13.0, with Mac OS X 10.10 "Yosemite". I am not getting an option to Replace. In Organizer, the file is shown as locked, with Edit in Progress. If I exit and restart Organizer, the condition is cleared and the file seems okay, with edits intact, but:
1. that's no way to operate normally
2. I'm concerned that 'in Progress' status may fail to clear
3. just from this thread alone, it is evident that Adobe doesn't bother to fix finger-in-your-eye level bugs that persist across many revisions
4. this is pretty typical of my experience with Adobe, and evidently for others as well
5. I really like Elements, but am so frustrated by Adobe's lack of support that I'm open to alternatives - suggestions anyone?