ok, This could be because of the following reasons
Please make a note that the QVW file when you view them in your local QV Desktop client and in Accesspoint both work little different especially when it comes to Section Access. So you check if you can view the data in Accesspoint with you credentials
-> If you can view the data in AccessPoint and the user cannot view it, then User was not given the read access. So check that
--> If you cannot view the data in Accesspoint, then check the code of section access how you have written.