Ah I see. This JCE issue will be fixed in the next update. In the meanwhile you can fix it manually by editing this file :
/modules/mod_minifrontpagepro/Helper/MinifrontpageproHelper.php: then add this code
// Added JCE PRO support
if ($orig_image == NULL) {
$orig_image = $images->image_intro;
}
at line 215 after code :
$orig_image = strstr($images->image_intro, '#', true);
and this code :
// Added JCE PRO support
if ($orig_image == NULL) {
$orig_image = $images->image_fulltext;
}
at line 222, after the code :
$orig_image = strstr($images->image_fulltext, '#', true);