Not happy about the problem, but definitely happy that I saw this post! Least I have some information now on what might be causing the issue. Address bar issue began after updating to 10.11.3.
Update: Yes, turning "off" Safari Suggestions or turning "on" private browsing mode seems to fix the address bar issue. Otherwise pages do not load, you cannot shortcut "command L" into the address bar, and typing an address glitches out and duplicates itself in the bar, like the pic in the previous post.
Update: Yes, turning "off" Safari Suggestions or turning "on" private browsing mode seems to fix the address bar issue. Otherwise pages do not load, you cannot shortcut "command L" into the address bar, and typing an address glitches out and duplicates itself in the bar, like the pic in the previous post.
Last edited: