I have set up a site (www.kayakkauai.com) and everything was working fine (v 1.39) until about a week ago, now only one product can be added to the store at a time. If you add another product, it replaces the one that is currently in the cart.

THe client may have made changes to the config but swears they have not, and I am at a loss on where to start looking for issues.

Can anyone recommend ideas that could help me know what to look for?

Thanks