I changed Host.HtmlEditor settings to allow file uploads of up to 30Mb and now no file will upload no matter how small. I changed the settings back to what they were before but everything is still broken. Any attempt to upload a files gives this event log entry:
Message: DotNetNuke.Providers.RadEditorProvider.FileManagerException: Unable to complete operation. An unknown error occurred. /Portals/24/LogFiles/DSC00631.JPG | 704530 ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Providers.RadEditorProvider.FileSystemValidation.Check_CanAddToFolder(FolderInfo dnnFolder, Boolean isFileCheck, Boolean logDetail) at DotNetNuke.Providers.RadEditorProvider.FileSystemValidation.OnCreateFile(String virtualPathAndFile, Int32 contentLength) --- End of inner exception stack trace ---
If anyone can help I'd be most grateful.