rss feed crapped out

my rss feed at https://visible-form.com/blog/wp-feed.php was working fine, then all of the sudden stopped working. The only thing I can remotely relate it to was that I changed my permalink structure a few weeks ago, could that be it?

anyway i’ve switched my feed to use the url https://visible-form.com/blog/?feed=rss and that seems to work ok. I’d still like to get the other ones fixed though.