I have version 5.0 and am getting this same error.

On my local development machine I have a virtual directory in IIS mapped to a network share.

I receive the "Setting not Fould!" error whenever I click on either of the insert image buttons or the downloadable files button. My code for setting the ImageGalleryPath is as follows:

Editor.BaseHref = "http://localhost/"

x = virtual_directory & folderName & "uploads/images"

Editor.SetSecurityImageGalleryPath(x)

I can confirm that the path using this virtual directory is correct by successfully opening an image like this:
http://localhost/virtual_directory/folderName/uploads/images/test.gif

Any ideas why I would be getting this "Setting not Fould!" error message?

Thanks.