I got some problems with locales upgrading from 2.37-3 to 2.37-4.
Warning: Invalid locale (please review locale settings, this might lead to problems later):
locale::facet::_S_create_c_locale name not validand downgrading to 2.37-3 fixed the problem... if this can help to narrow down the possible causes.
-- Ivan Sergio Borgonovo https://www.webthatworks.it https://www.borgonovo.net