Validation error when submitting a form

Hi,
My first post so please don't come down on me like a ton of bricks if this is the wrong forum.
I created a form in Adobe LiveCycle Designer 7,0,050519,0.
Some users could not send the results back via the email button, but others did. That's okay - maybe the failed users were using Adobe Reader 6 instead of 7.
However, now when I open the pdf file on my pc in Adobe Professional and test it by pressing the send email button in the form it always gives a message stating that "at least one required field was empty on export" and marks ALL the fields although they are all filled in.
Even when I import one of the results returned to me I still get this message, even thought it's the same form as others successfully used.
Is there something that I need to adjust in the reader settings in order for it too work? As I say, the fields ARE filled in.
Best regards,
A Rick

From my experience, it looks like you have filed(s) setting as User Entered Required and this field(s) do not be filled.
William, Adobe Systems

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