A customer has a very strange problem with my plugin where the "You do not have permission to view this page" message shows up after the page changes.
Specifically the page will include an external file and then on submission a totally different file is included to represent going through stages. On Stage 2 of the process the user gets that message but it is only happening with one person.
To me this has to be their blog but when I login on an account they made for me, it works fine. Thats strange. Both user accounts are admin set.
Is there anything else in the blog that could cause this. All I can think is a permissions editing plugin but they have none either.