The solution is to login with &displaytype=raw and disable the CPAN and EDC nodelets from user settings. The problem is that you have to login in order to change user settings, but having the suspect nodelets activated prevents you from logging in. On Petruchios advice we logged in using a URL of the fashion:
Then the problem was trying to get to user settings without having nodelets turned on. Fortunately I had a bookmark for user settings. Even if you do succeed in logging in, getting to user settings and turning the suspect nodelets off, the settings have a magical way of turning themselves back on. Deleting your PM cookie is recommended at the onset of problems. You can always reset it once you think you have the problem licked.http://www.perlmonks.org/index.pl?user=XXXX&passwd=XXXX&op=login&displ +aytype=raw
My suggestion in the CB was that if there were a checkbox beneath the login/password box that allowed you to login directly to your user settings with &displaytype=raw in effect, it might serve as a temporary workaround for affected users. tilly suggested that I write this nodelet but Petruchio believes that the checkbox option is probably not feasible (I have no reason to doubt him). However, I have created a browser bookmark for the URL above and one for user settings, so I should be prepared if this happens to me again. I've wasted a full day on this problem and hopefully, this post might spare a few other users the same aggravation. I guess this is pennance for my last PMD fiasco.
"If you are going through hell, keep going." -- Sir Winston Churchill
Sorry, as I wrote this node I had to rely solely on the recollections of an almost 43-year old, caffiene/sleep deprived brain.