Redirect after cache, redirects to same page always

hello,
when I submit a form, with a redirect action with system cache OFF, everithing work like a
charm. The user is redirected to the thankyou-page

If I turn system cache ON, the forms will "fake" submit, and return to itself, without sending the mail nor displayng the thankyou-page

I set RelativeUrl to NO in the form settings. Cleared the cache, but nothing changes.

Joomla 2.5.11
Chronoforms 4.0.1

Please help :-|
Thanks a lot

Hello,

Please set the "relative url" to no then clear the cache then submit the form, what's the url accessed in the browser after submitting the form ?

How do you display the form ? using a module/plugin or through a menu item of type Chronoforms ?

Regards,
Max