On the General tab there is a setting for the Maximum submissions to allow. This field must be left blank for no limit. If your users are getting the "Maximum submissions allowed" message then this was not left blank. To turn this off on a live form or setting:
- On the General tab click "End form now"
- Click "Edit the form"
- Leave the "total submission" box blank
- Click "Activate the form"
The only catch is now you will have two result sets. Every time you stop and start a form or survey you get a new result set.