My product name usually contain Japanese and Chinese character. On paypal page they cannot display correctly like this "å¤§äººã�®ç§�å¦ Vol.28"
I've checked both Cart66 and paypal both using Utf-8 as the coding.
in addition. i found this script in cart66 / paypal_checkout
echo "\n<input type='hidden' name='item_name_$i' value=\"" . $escapedName . "\" />";
try to put something like name="charset" value="utf-8" without any luck.