I have this problem earlier in 2017 and now its still occuring.
I am installing NAV 2018 on my computer my computer name is MVEZIR2 my host operating system locale and all language settings are based on Turkish settigs. Everthing works fine but when I try to open page on Development envoirement. It says there is no working instance for this database.
and it collects wrong server name. It thinks my server name is mvezır2 on lower case, but it has to be mvezir2, I change it from server instance table but every time service restarts, It re change it.