I had this “Are you sure?” message appear when adding a feed that was particularly large. It didn’t appear when I added a very simple basic feed with just 2 items.
I just navigated away from the page and the plugin continued to work as normal.
I’ve also now installed the author’s plugin to limit posts and using that with my large feed (to limit FWP to only generate the latest 10 posts) seems to be working ok: http://projects.radgeek.com/fwp-limit-posts-by-date
(This is working on a localhost (XAMPP) install using WP 3.7.1)
Not sure if this post is helpful but I just wanted to let you know it can work in some circumstances.
Are you working on a live server or on your local machine?
Ok, so… It works, but please read under
@pinkishhue : i tried a short feeds, and it does not change. But, when trying your idea, i found a solution.
When you click on “syndicated sources”, there is directly a form “new source”. Using THIS field works (with any feed)
When you click this “add” button, either with no url, or with a password protected url, you arrive on an error page with either a “Alternative feeds” box or with a “Find feeds” box. There is a submit button called “check” and THIS one does not work.
Again : I was trying with a feed protected by username/password, so after adding the feed, you arrive on this error page where you can see 2 boxes : “Find feeds” and “Option 2: Unknown feed”. The first box does not works, the second (with the button “use this feed”) is OK.
This is a workaround, i’m not sure it should be declared as “solved”.
