Hi Ubaldo,
The reported behavior is due to the browser caching mechanism. You can solve the problem by following the steps below:
1)
Register the external dialogs of RadEditor:
1.1) Copy the EditorDialogs installation folder to the root of the web application / web site
1.2) Set the ExternalDialogsPath to point to the EditorDialogs folder
2) Open the EditorDialogs\ImageManager.ascx file and add a random query string to the image src, which will tell the browser to refresh the image automatically and to not cache it, e.g.
//NOTE: we cannot use a random src to bypass the IE browser cache in the source code, because it will make browsing images a lot slower
img.src = src + "?param="
+ Math.random();
For your convenience I have attached the modified ImageManager.ascx file.
Best wishes,
Rumen
the Telerik team