since about a week, whenever I try to do something important the page is not loaded:
only white page as result when
- trying to update a plugin, either already after clicking on "update" or after confirming my license key) - in both cases no success in updating- after changing a language key (though the key is changed afterwards)- after changing any plugin settings (though the new settings are actually saved)- after signing out- after joining the site (filling out the form), but the new account is added

what could be the problem?