Single digit prices with zero cents are defaulting to tens and I cannot change them, for example €2.00 becomes €20.00.

I've edited the buttons to 1.99 without issue but on changing it back it reverts to 20.00, I tried entering it as 02.00 still 20.00. All other buttons which have single digits but cent amounts work fine, it is only single digit even amounts which are causing a problem.
I am using CS6 on Windows 7 but the problems seem to be on-line with the buttons.

I'll need to troubleshoot directly, see the private message section.

Hi Jason, thanks for your reply, I've sent you a private message.

So you are using the paypal hosted buttons?

login to your paypal account, you can access the buttons through your paypal account to change the settings, you should be able to change the price that way.

Thanks Jason, your advice was spot on and the problem is sorted.

glad to hear it is working.