depending on web hosters, the images are not displayed

some hosting companies don't allow the use of "getimagesize" for url links
in this case, this is better to use full path to the image
for example :
in taxonomy_image.module line 266 and 267
comment line 267

//    $img = getimagesize($image[$tid]->url);

change the line 266 to :

$img = getimagesize($fullpath . $image[$tid]->path);