No one here knows this WAMP software? I found its not a Nextgen issue as i tested other gallery and sliders and it has to do directly with jpg thumbnail editing only - gif, png thumbnail editing works fine within the wamp - so it must be that some service needs to be turned on in the wamp - when i test live on my live vps - editing jpg thumbnails just work without errors. Its only when i do it locally with the wamp that it does not work. This is the code in the area
case 'JPG':
if($name != '') {
@ImageJpeg($this->newImage,$name,$quality) or $this->error = true;
}
else {
header('Content-type: image/jpeg');
ImageJpeg($this->newImage,'',$quality);