So out of curiousity, I tried to edit this new page the plugin created when I deactivated and activated again...
Why? Because I wanted to disable the commenting on this automatically created category page (/video-more). So i don't even go to the actual edit screen because i'm scared it will break everything. I just go to admin>page>quick edit and check off commenting for this page.
Widget links, author links, category links all went to home page or 404.
I tried saving permalinks, nothing.
I tried saving permalinks to default, then trying the links, nothing,
I tried saving permalinks to default, then back to my permalink structure, nothing.
This was all too familiar.
I deleted the video categories page that had been working prior to this edit (so that it was completely trashed prior to these next steps).
Sure enough, it created two pages again--videos and video categories.
Now it all works again.
Basically, this video categories page is so sensitive that you can't even EDIT it or it will break everything, at least on my site.
There must be a way to correct this...The widget links/author links/category links are way too sensitive. There must be a way for them to correctly identify which page has [videomore] on it.
Such a sensitive plugin. 3 days, it's finally working.
It's great....but it's been a pain.