Since my last post I have been able to isolate my problem to the following:
<td class="main" valign="top">' . $order->products[$i]['name'] . ' ' . $return_link. .'<br><small><i>' . $desc['products_description'] . '</i></small>';
As long as this part of the mod is in account_history_info the page will be blank, if I revert it back to its original code:
<td class="main" valign="top">' . $order->products[$i]['name'];
the page displays correctly(without the RMA part) even with all the other mods made, any ideas?
As for the problem I had with order.php, I had some misplaced items there, its fixed now.