Could anyone advice please, what could be the cause of such problem:
After each restart of Oracle SQL developer NLS_LANGUAGE settings are being reset each time. For example, when just opening a new session, NLS_LANGUAGE is set to LATVIAN and each time when starting SQL Dev, we need to run "alter session set NLS_LANGUAGE = 'AMERICAN'" to set it back to American.
Even that in Options -> NLS everywhere is set American.
We've checked all main lanaguage/location/region settings and set American everywhere, but still after re-launch only NLS_LANGUAGE setting is being reset, rest (like NLS_TERRITORY) are fine.
What hasn't been changed that triggers each time that reset?