I'am running a 4.7.27 civicrm on wp. Strangely, for some reason i still ignore, unauthenticated visitors can't suddenly access the petition form (civicampaign) what is a quite big problem because i am engaged in such important campaign.
After reading documentation, I tried to change the access rights from the page "WordPress Access Control".
For another unknowned reason, the "WordPress Access Control" form looks empty (screenshot) and can't be modified despite the fact that i am admin.
If somebody can help me...