Did you ever solve this issue? I expect that if I date from Github, it will solve this issue, but I'm not ready to do this on my live site. Thank you.
http://fabrikar.com/forums/index.php?threads/field-data-removed-on-validation-error.47317/
http://fabrikar.com/forums/index.php?threads/field-data-removed-on-validation-error.47317/