I've just installed on my desktop the 2.2.0-1 version delivered by Fedora 23 updates repo. The overall layout is much prettier and I'm eager to test the professed support for retina displays when I upgrade LyX on my laptop.
However, I have refrained from installing the upgrade on the laptop because when I tested the 2.2.0 version with the desktop I've found out that some useful mathematical keyboard shortcuts were no longer working. For instance: "ALT+M F" did not entered the \frac command; instead it just will open the dialog window for math spaces. "ALT+M (", "ALT+M [" and "ALT+M {", instead of creating the respective math delimiters would simply do nothing. Also, exponent generation with the caret "^" works sporadically. There may be other shortcut problems that I have not detected yet. Anyway, those I mentioned are annoying, because the shortcuts significantly speed-up the typing of mathematical expressions. Have you noticed something similar, or can this be a specific Fedora issue? -- Rudi Gaelzer Institute of Physics Federal University of Rio Grande do Sul BRAZIL Registered Linux user # 153741