My site was running for a while then all of a sudden potential members get a "error" message after filling out the initial information. There is no explanation regarding something missing or too short or long. The join form is not really modified very much from the out-of-box version. Only one additional field was entered, and again it was working for a few months before this happened.

I have replaced the join_form.php file but same thing. The code looks intact, although I am not a programmer.

Site is www.cancervival.com and the version is 5.3

Any ideas? I've pulled all my hair out on this one.