Got this now:
Notice: Undefined index: user_import_settings en user_import_configure_form_submit() (línea 223 de /home/MYSITE/www/SUBFOLDER/sites/all/modules/user_import/user_import.admin.inc).

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robert castelo’s picture

robert castelo commented
Status: Active » Closed (cannot reproduce)

I haven't been able to reproduce this bug.

I started a new import, set a few fields to match csv columns, saved the settings - didn't find any problems.