I'm developing a site on .Net 4 on Windows 7 32-bit in VS2010. I've updated to the May 2012 version of the toolkit and tried using the ImageUpload of the HtmlEditorExtender, but whenever I try upload an image, it just puts a red (error) next to the image name. I've tried giving Everyone full access to the folder where the image should be saved, but I cannot even see that it is getting to that point. I've also tried using just the AjaxFileUpload control to test it, but it does exactly the same. Any ideas?
Comments: I've also tested this on Chrome, and it goes a little further, saying "uploaded 100%" although it has gone through, but if I view the developer console there is the following error: Uncaught Sys.ArgumentException: Sys.ArgumentException: Cannot deserialize. The data does not correspond to valid JSON. Parameter name: data ScriptResource.axd:4271
Comments: I've also tested this on Chrome, and it goes a little further, saying "uploaded 100%" although it has gone through, but if I view the developer console there is the following error: Uncaught Sys.ArgumentException: Sys.ArgumentException: Cannot deserialize. The data does not correspond to valid JSON. Parameter name: data ScriptResource.axd:4271