I'm running Fedora 27 x86_64 (rawhide) and have noticed a problem in text windows with Firefox.
The problem exists in both the FF released version AND the FF beta version. It could be Firefox.
The problem exists with KDE and WindowMaker as the desktop manager.
What I'm seeing:
I have the caps lock key mapped to the ctrl key so when I type ALL caps I have to hold down the shift key. When I try to insert a space between words I have to release the shift key, otherwise the space is ignored. This used to work but since I reinstalled this system the keyboard is acting strangely. This behavior plus certain other letters seem to want to generate a cedilla or an accent grave or accent acute or an umlaut. There are a few other characters that behave similarly. Coincidentally I started getting messages about python forcing "PYTHONCOERCECLOCALE=0". Maybe this is not related to this problem, I can't tell. Could this be a LOCALE issue?
I can't tell if this is a bug or just a UFU (User Foul Up). Any thoughts/hints/tips/suggestions would be gratefully accepted.