Have you tried a different web browser or clearing your history/cauche? I've seen Safari do some weird things.
I doubt the CC problem is related to mailing vs billing address since mine are different and I have no problem.
Regarding other tax s/w, there definitely is some truth "you get what you pay for". The free or less expensive tax software typically has a less refined user experience, clunkier menus and less helpful question prompting. TT is normally pretty good with those sorts of things.
