Ok, finally had a few minutes to look at this and it is a simple fix it seems.
In the wxStory-inc.php script... scroll down not too far and you'll see a group of "preg_replace" like so...
$html = preg_replace('/°/', '°', $html); // change it to an entity
$html = preg_replace('/‘/', '\'', $html); // change stray character
$html = preg_replace('/<u>/', '', $html); // fix error
$html = preg_replace('/<\/u>/', '', $html); // fix error
$html = preg_replace('/<br>/', '<br />', $html); // fix error
Add these to that group...
$html = preg_replace("/\.png\?(.+?)/" , ".png " , $html); // cut off random numbering of png
$html = preg_replace("/\.jpg\?(.+?)/" , ".jpg " , $html); // cut off random numbering of jpg
and it should fix it. At least it did for me.