Problem was solved, my host guys figured the issue out as follows, worth noting for anyone who comes across the issue...

"issue with the php session save path so created a custom php.ini for the domain specifying the path location to its own individual session folder."

Hi all, had an email from a one of my customers asking about their Admin, they can log in but the admin loads a white page.

The hosts have checked for errors from the server but all is good, but this error is visible in the Abantecart log, Id appreciate any Abantecart users thoughts....

2018-06-11 10:43:21 - warning:  AbanteCart core v.1.2.12 Cannot modify header information - headers already sent by (output started at /home/ovmediac/dhchildrensboutique.uk/core/version.php:1) in <b>/home/ovmediac/dhchildrensboutique.uk/core/lib/request.php</b> on line <b>227</b>
2018-06-11 10:43:25 - warning:  AbanteCart core v.1.2.12 Cannot modify header information - headers already sent by (output started at /home/ovmediac/dhchildrensboutique.uk/core/version.php:1) in <b>/home/ovmediac/dhchildrensboutique.uk/core/lib/session.php</b> on line <b>113</b>
2018-06-11 10:43:25 - warning:  AbanteCart core v.1.2.12 session_start(): Cannot send session cookie - headers already sent by (output started at /home/ovmediac/dhchildrensboutique.uk/core/version.php:1) in <b>/home/ovmediac/dhchildrensboutique.uk/core/lib/session.php</b> on line <b>114</b>
2018-06-11 10:43:25 - warning:  AbanteCart core v.1.2.12 session_start(): Cannot send session cache limiter - headers already sent (output started at /home/ovmediac/dhchildrensboutique.uk/core/version.php:1) in <b>/home/ovmediac/dhchildrensboutique.uk/core/lib/session.php</b> on line <b>114</b>
2018-06-11 10:43:25 - warning:  AbanteCart core v.1.2.12 Cannot modify header information - headers already sent by (output started at /home/ovmediac/dhchildrensboutique.uk/core/version.php:1) in <b>/home/ovmediac/dhchildrensboutique.uk/core/engine/language.php</b> on line <b>368</b>