[Zope] Text area problem

Hello all, I was wondering if someone can help me. I have a form with an text area. If someone puts a lot of text in the area the submit button does´t preform the given action. But if the person doesn´t enter to much text the form does preform the given action. The text area schould change a property of the type text. Can anyone explain why the form doesnt work with a lot of text in it? Or maby someone who experienced the same problem cn tell me how he/she solved it? Hope someone can help me!! James van der Veen