Is your installation of Checkbox configured to display incomplete responses? If not it is possible that there are incomplete responses preventing the editing of the survey. The "Report Incomplete Responses" option controls this functionality and it can be found by navigating to the Settings -> Preferences page.
Alternatively you can disable the feature which prevents the editing of surveys once responses have been collected. To do this a System Administrator will need to first enable the "Allow Editing of Active Surveys" option. This setting is located on the Preferences page as well. Once the system wide setting is enabled Survey Administrators are able to either enable to disable the "Allow editing of this survey while it is active and collecting responses" option found on each survey's Properties page.
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