Ok, that seems to have resolved an error, but it still does not work, now the log is:

AH01071: Got error 'PHP message: PHP Notice:  Undefined index: w in /var/www/vhosts/xxxxxxx/httpdocs/v2/inc/classes/BxDolTranscoderImage.php on line 176PHP message: PHP Notice:  Undefined index: h in /var/www/vhosts/xxxxxxx/httpdocs/v2/inc/classes/BxDolTranscoderImage.php on line 176', referer: https://xxxxxxx/v2/studio/design.php?name=bx_protean&page=styles