Often when I work in Freemind, the file I was working on opens twice or doubble. See the screenshot I added to this post. Then I spend hours mindmapping and saving in between. When I quit the programm, the doubble file gets lost and the original rests on my hard disk. This results in hours of work simply lost. I use Mac OS 10.6.8 and java version "1.6.0_26". The only workaround I found so far, was when opening a file, immediatly closing the twin version. What ads to the problem is that the twin file doesn't always appear. Sometimes it does, sometimes it doesn't. Is there any way to fix this bug? I'm not familiar enough with the command line but if that's the only option to fix this, I'll try. Thanks in advance.