Why do you need to redirect back to the same view to display the error? The normal way of doing this is basically what you currently have: if there is an error in the form in the POST, immediately redisplay the form.
I think the reason this is failing is because of the formkey technique used by web2py. When you auto-generate a form (as with SQLFORM), a random "form key" is generated and inserted into the form. The same key is also saved in the web2py server. When the form is submitted and web2py checks it with form.accepts, it first verifies that the submitted formkey is one that was previously generated by web2py. If the key is found, it is removed from the list of pending formkeys. If the key is not found, the form is reset. The point of this is to prevent people from accidentally submitting the same form twice (imagine accidentally clicking the submit button twice when submitting a credit card purchase). But I bet you're running into a case where you redirect and send the form vars, but the formkey is no longer valid (since it has already been generated and accepted once), so the form is reset after the redirect. Long story short, regenerate the form in the same request if there is an error - don't redirect unless there's some reason for this that I'm not realizing. Cheers, Kevin
