Brief
We have updated the logic for image names generation.
 
Description
Now the script changes all special characters (e.g. $%^& etc.) except English letters, digits and some common characters.
 
Solution
Download the updated version of the file:
http://www.viart.com/downloads/image_functions-4.zip
 
Further, extract the 'image_functions.php' into 'includes' folder of your shop via FTP in BINARY mode replacing an existing file. Please do not forget to make a backup copy of the current file in case something goes wrong.