Still Irritated Only More So!!!
In reply to the comment from randofo - I am indeed using IE8, with internet security set to medium-high. Cookies are enabled.
I have searched the forums and tried what "fixes" I found to no beneficial result. One of those suggested removing all security, which I tried very briefly. No help.
I occasionally use private browsing mode, but not at instructables.com.
In reply to caitlinsdad, thanks for the helpful comment. When a site charges for a service, they have declared themselves to be professional and need to accept those standards.