I started reciving 405 errors on my website last night. I just did a plugin conflict test and it came up that when I tried to set up the SMTP in Ultimate Branding that it started causing these errors.
Once I took the settings out of SMTP everything works as it should.
Not sure if it's just me or a bug. I noticed some others having issues with SMTP in the forums as well.
I would like to be able to set this up or figure a workaround.
I'm setting up a membership site with membership pro 2 and coursepress pro and e-newsletter.