Currently, the FEI databar is recognized by a 1 pix height white line between image and databar. This was developed based on images saved from a relatively older version of FEI xtUI. Images from a later version xtUI does not show this white line and cause the plugin to malfunctioning - generating a 1 pix height databar file.
This can be rewrite to set a known image pixel resolution in a dialog box.