my nav bar remains white

oh I restarted it just now and it worked lol..hopefully doesn't become like that again..altho it went back to my pixel navbar..at least it's transparent now lol
 
Switching launchers doesn't help. As centerman66 says, there is a long thread that explains and suggests a work around. Happens mostly when switching from split screen apps. Restart works but if you don't exit the split screen apps correctly you have to restart every time.