I have SEO working with this module no problems at all.
SEO Configuration:
index, product_info, products_new, products_all, featured_products, specials, contact_us, conditions, privacy, reviews, shippinginfo, faqs_all, site_map, gv_faq, discount_coupon, page, page_2, page_3, page_4
You don't want SEO on your checkout page anyway, there's the list of files that SEO rewrites the URL - check that your checkout IS NOT in there. I hope that's the problem you're having
CC INFO BUG - WRONG CC INFO
If you go to checkout and put in the wrong number, you're taken to the page with the error header. Below, on the same page, you can enter your CC# again, but no matter what, your CC info will not take. If it's a good number or bad, the page looks like it simply refreshes when you click continue"
I have recreated this error (bug) on the demo site earlier in the thread, if I enter a 'bad' CC number, or screw with the date, when I try and enter the correct CC info on that screen (the same one where the error message appears) and I enter the correct date, CC, etc.. the page simply refreshes and does not 'take' the CC info. If you reenter the CC info on the now refreshed page, the CC works. To me, this is a fairly bad bug.
Thanks for reading