thanks for the reply Jules – could it be due to an out of date php version?
it’s working on our dev site, but not clients live server.
here is the form code – truncated –
[text* first-name placeholder "First Name"] [text* last-name placeholder "Last Name "][text* company placeholder "Company"]
[email* your-email placeholder "Business Email"] [text* buiness-phone placeholder "Business Phone"]
[select* your-industry first_as_label "Your Industry" "Academic"
"Automotive"
"Advertising & Media"
"Other"]
[select* country first_as_label "Your Location" "United Kingdom" "United States" "Afghanistan"]
[group group-us-state]
[select state first_as_label "Your State"
"Alabama"
"Wyoming"][/group]
<br />
[group group-us-revenue]
[select revenue first_as_label "Revenue"
"$0-24 million"
"$25-$99 million"
"$100-$999 million"
"$1+ billion"][/group]
[acceptance acceptance-530]I accept Privacy Policy [/acceptance]
[checkbox checkbox-910 use_label_element "I would like to receive the Monthly Newsletter|Yes"]
[submit class:grn-btn-std "Download now"]