In the file browser, I'm having a "XML Request Error : Internal Server Error (500)" . How to find out the problem? The editor uses a "connector" in the file browser to communicate with the server, through XML, and retrieve files and folders. The connector is available in different programming languages, as AS P and PHP for example. By default, it is configured to use the ASP one. Be sure you have configured the editor to use the appropriate connector for your preferred language. You can do that in the fckconfig.js file. If the configurations seem to be OK, you can use the test page that comes with the connector to check the XML responses that the connector sends and maybe identify errors on the server side. The test page is located at "editor/filemanager/browser/default/connectors/test.html". Another thing to check is that the target folder for the files exists in your server. By default it uses the "/UserFiles/" folder, but it is configurable. The editor uses a fixed structure in the target folder that separate files used on different dialog boxes, respectively the link, file and flash dialogs. For example, if you are using the "/UserFiles/" as your target file, it will use "/UserFiles/File/", "/UserFiles/Image/", "/UserFiles/Flash/" and "/UserFiles/Media/". The connector tries to create those directories automatically, but on some configurations they need to be created manually to make it work properly. Note for ASP connector Another workaround seem to re-install VBScript runtime (from http://msdn.microsoft.com/scripting) and/or MDAC (from http://msdn.microsoft.com/data/mdac/). Ultimate way : register the scripting library with running "regsvr32 vbscript.dll" in the "\system32\" folder.