If you are using the built-in PayPal Website Payment Pro (paypalprodpshopcheckout.asp) and receive an error when selecting an "Other Payment" while leaving the "Comment Box" empty, the following fix will need to be applied to paypalprodpshopcheckout.asp
1. Open the file "paypalprodpshopcheckout.asp" using a text editor and locate the following code:
2. Now, add the following code below :