There has been an error processing your credit card

Up until Friday we were taking orders on our site without a problem. We are using a Paypal account with Zenat design's credit card module on Zencart 1.2.7.
Now every order placed gets the following message: "There has been an error processing your credit card". This includes credit cards we used last month to test the site that worked fine then.
Has anyone had a similar problem and if so, do you know what might be going on?
Thanks
Paul
https://www.wanderer.com/store

Well, we figured it out, and it's a weird one.
We were trying to dress up the titles to the items so that the line breaks were better so we inserted <br> tags in them. Come to find out, the tags some how caused a meltdown when processing credit cards. Any item without a tag was fine. Once they were removed, eveything was fine.
Z

Thanks for the update and the solution to this issue ...