Wordpress RSS Broken After 4.3 Update
Final Verdict: W3TC Plugin was rendering cached RSS feeds as text/html, which broke most RSS readers. Disable W3TC until it's patched.
Well, this is annoying, I have scripts that use Simplepie to pull RSS information from our network of Wordpress sites. Unfortunately, this script no longer works since updating to Wordpress 4.3
According to a post in the help forums, W3TC may be the issue. Going to try disabling that now.
It seems as though the RSS feeds are being rendered in HTML. Is that the problem?
Looks like Revolution Slider was broken in the update too.
Is this a problem that I should work on, or wait for Wordpress devs to fix? Priorities, priorities...
UPDATE - Here's a potential solution, but it didn't work for me:
Disable the RSS feed caching in W3TC (W3TC -> Page Cache settings page) and purge all caches in W3TC. If you use Cloudflare together with W3TC, don't forget to purge the Cloudflare cache manually on the Cloudflare admin page because the internal Cloudflare plugin in W3TC has no effect on purging the Cloudflare content.