I'm getting a popup with simplewall blocking itself, while trying to access the IP 93.184.220.29.

What's that supposed to mean?
It's a bug where Windows going to DNS resolution for hosts addresses. New beta fixed (maybe).
ps: if not, you can disable hosts support for rules entirely in settings.
Sorry, it's not DNS resolution, this is certificate OCSP query doing by Windows.
Haven't seen it since v2.1.1b, but if so, I'm guessing I should allow it?
Yes, i fixed this, anyway, so you can wait for next build.
Cool! Thanks :)
2.1.2 have lot of fixes about this, so check it.
fixed