We are not aware of any issues with the Auctiva uploader at this time that would cause difficulty with uploads. However, the uploader does require the most current version of Java to operate correctly, so please be sure that your Java is up to date. You can check this at http://java.com/en/download/index.jsp - where there is a link: "Do I have Java?" under the download button, where you will be able to see which version you are running and update it if needed. Also note that the download and install are separate steps.
If you continue to have difficulty uploading images, please file a support case from the Help tab of your account letting us know the details of what occurs for you so we can take a look, and we will be happy to assist you.