Calendar page showing in category widget

Do you mean that when you use the Category Widget (standard WordPress) as a way to give users access to your posts by category, the Event Categories also show up in that list?

That’s the problem I’m having — and while clicking on the links for the *post* categories takes me, as expected, to the Archive pages for those categories, clicking on an *event* category takes me to a page of the form

https://mydomain.com/?cat=20

which gives a “page not found”. I’ll start a new thread if that isn’t your problem, but thought I’d try to clarify.

Just a note that I can’t reproduce my problem on a clean install of WordPress 3.5.1 with only Ai1EC v 1.9.5-Standard. So sorry for the digression.