I'm running lyx-2.2.0 on Slackware-14.1. A KOMA-script Article class document contains three Greek characters in the text: \textrho, \texttau, and \textphi. The first two have correct spacing before and after the letter, but phi seems to lack that spacing in both places where it's included. See the attached .png; the phi is in the third row with the word 'is' squashed against its right side. I'll put a protected space there, but it might be a glitch that can be corrected in the next release.
Rich