Here is a quick hack I used to override the default. If I have time and use the plugin again I will post a better fix…
(excerpt of advanced-recent-posts-widget.php near line 56)
if( ! $thumb_h = absint($instance[“thumb_h”] )) /* ORIG $thumb_h=50 */ $thumb_h=120;
if( ! $thumb_w = absint($instance[“thumb_w”] )) /* ORIG $thumb_w=50 */ $thumb_w=120;
/* Doesn’t allow the thumbnail dimensions to be changed after it is set. Override the conditional above… */
/* START HACK */
$thumb_h=120;
$thumb_w=120;
/* END HACK */