Title.
We have made fix in order_info.php after release 3.0 has been issued on February, 27.
 
Description.
There was a bug in calculating commissions for affiliates and merchants simultaneously.
 
Solution.
Please download updated version of the file from here
http://www.viart.com/downloads/order_info-3.0.zip
Then extract file order_info.php into the root folder of your shop replacing existing one.