Due to the recent security issues with Adobe Flash we have turned off the 'Flash Uploader' option. This will impact when adding attachments to a post or when uploading files to the Media Gallery. The Flash Uploader was used for attaching/uploading multiple files at once instead of having to select individual files one at a time. One point of emphasis is that there are no known security issues with the forum software that powers our site, just the third-party Flash Uploader component done in Adobe Flash. For now, until Adobe Flash is updated, it is best to err on the side of caution and disable the component.