Crecit Card Checkout Problem Looping Back To Step Two

[seaholly]

I am currently using 1.3.0.2. I need to access credit card numbers and manually enter them on my machine.
Previously had 1.3.0 with SSL installed and then was upgraded to 1.3.0.2.
Installed mods are Chemo's SEO URLs , Google Sitemap, EZ Populate and Link Exchange.
Orders using paypal payments have gone thru successfully throughout without a glitch after upgrade.

I have my first customer using credit card as method of payment. She can't get past Step Two and is looped back again to Step Two with all credit card info lost. I ran a test myself using 4111111111111111 and 123 and got the same result that she did. I emailed my host and they encountered the same problem but have no answer from their end.

I've been searching the forums for over 3 hours. I tried uninstalling and reinstalling the Credit Card portion under Payment Modules in Adminstation - no luck.

And help or solution would be greatly appreciated.

My store link is:
https://betsyvintage.com/

[seaholly]

Happy Update!

Disabling the SEO URL module fixed everything. I don't think that search engines cared for it anyway.
Wish that I could take credit for figuring it out by it was my Zen Certified host - they persevered until it worked. I know I can't mention names but would be happy to recommend by email (I think that's allowed, isn't it? - delete the above if I am out of line).