This is how you can reproduce it on:
http://demos.telerik.com/ASPNET/Prometheus/Editor/Examples/Default/DefaultCS.aspx
http://demos.telerik.com/ASPNET/Prometheus/Editor/Examples/Default/DefaultCS.aspx
- Upload an image in a folder that contains a space like:
/aspnet/prometheus/Editor/Img/UserDir/PublicRelations/New Folder/ (important with the space between New and Folder) - The image adds perfectly
- Right click on the image and select Image Map Editor
- The image in the dialog is broken and the dialog displays different errors. If a zone is added and the dialog is saved the url for the image screwed up.
Probably easy for you to fix, seems to be something with encoding of spaces. I'm using IE7.