Server Timeout when click Buy Print under image

I have installed the Fotomoto plugin under Wordpress, set up Fotomoto account, put site id under Wordpress/Fotomoto Settings.

Appropriate Images Show Buy Print / Buy Card links under the Image.

Clicking on Buy Print times out with message "Server Timeout. Try again later".
Keep re-trying, never works.

Click on Buy Card sometimes works, sometimes not.

I notice that there are a number of reports of this problem from 5 and 6 years ago, with no information on how/if the problem was resolved. Is this still a problem? Doesn't look very good to a potential customer!
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