Several users are complaining about this error whenever they try to submit one of our online forms: "invalid form id(s) submitted".
The problem is I can't replicate this error. Also, many people have submitted the same for without any problems.
I found this link http://www.solspace.com/forums/viewthread/13745/#55777 which suggests it's to do with XID hash. If so, how can I set it so it doesn't expire.
Am using EE v2.4.0 FreeForm Pro 4.0.7.