In the process of testing WMYeditor in a CMS system I noticed that it seems to rewrite image paths if you do not use a full URL.
An example follows:
1) Editor is loaded from some path "/base/admin/editor"
2) Insert image with path "/base/img/image.jpg"
At this point the image is inserted correctly and all is fine.
3) Drag and drop the image to another position in the editor
Now when we inspect the sourcecode the image path has changed to "../img/image.jpg". The path is now relative, and will break if we attempt to view the output from another hierarchy.