Safari 5.0.6 and payment cards

Is there a problem with Safari 5.0.6 and the authorisation of credit and debit cards?

I wasted hours last night trying to book trains through the Eurostar web-site and car hire with Hertz.

I got right through to the payment card verification process then either got an error message or the page simply went blank.

I eventually got up this morning and booked them both successfully using Firefox 16.0.2.

I hope that I do not now have reservations for the whole train and a fleet of hire cars.

C.W.