I have to manually change the gamma value after each time I start up the game 
Same for me… very annoying
Same here!
same here, already made a post about this earlier
I have same issue , it is caused by an addon ( I didn’t had time to see which addon ) , but it saves an unecesary line into …/retail_/WTF/config.wtf and buggs the gamma settings
Potential fix in this topic:
It worked! Thank you so much! 
I’ve uploaded an addon to curse for people who don’t have much experience at tinkering with addon code. It might be a few hours before it’s available due to their approval processes. https://www.curseforge.com/wow/addons/details-fix
Poke around your graphics and audio settings and make sure they’re as you expect them to be after installing.
Addon also available here.
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