When I try to upload a png image with the radeditor image manager, it always fails.
It doesn't show an error, but the uploaded file is 0kb.
The filetype is allowed (File extensions allowed:*.jpg, *.jpeg, *.png, *.bmp, *.gif)
It only happens with png.
I tried to reproduce the problem but without success. For your convenience I have recorded my test in the following video http://screencast.com/t/U2HIV9Dz as well as attached my test project. Are you able to reproduce the problem using the provided project?