Somehow it just started working, I think it might have been because I changed the notification to default address, although I think I tried them all. We'll see if it stays stable, in the meantime the mail message has no form info and just looks like this
<?=$PROCESS_FORMID?>: <?=$FORM ?><?=$NL ?>
<?=$PROCESS_FORMTITLE ?>: <?=$TITLE ?><?=$NL ?>
<?=$PROCESS_FORMNAME ?>: <?=$NAME ?><?=$NL ?>
<?=$PROCESS_SUBMITTEDAT ?>: <?=$SUBMITTED ?><?=$NL ?>
<?=$PROCESS_SUBMITTERIP ?>: <?=$IP ?><?=$NL ?>
<?=$PROCESS_PROVIDER ?>: <?=$PROVIDER ?><?=$NL ?>
<?=$PROCESS_BROWSER ?>: <?=$BROWSER ?><?=$NL ?>
<?=$PROCESS_OPSYS ?>: <?=$OPSYS ?><?=$NL ?>
<?=$DATA[_FF_DATA_TITLE]?>: <?=$DATA[_FF_DATA_VALUE]?><?=$NL ?>
<?=$DATA[_FF_DATA_TITLE]?>: <?=$DATA[_FF_DATA_VALUE]?><?=$NL ?>
<?=$DATA[_FF_DATA_TITLE]?>: <?=$DATA[_FF_DATA_VALUE]?><?=$NL ?>
<?=$DATA[_FF_DATA_TITLE]?>: <?=$DATA[_FF_DATA_VALUE]?><?=$NL ?>
Can you tell what's going on?
