It worked just once for the first time

Hi
Installed plugin worked just one time – right after installing.
Then any of my changes doesn’t save. For example I change ”
Set filter automatically” to “no”, click “save changes”, plugin update the page but when it load, changes are not saved. Automatic filter still in status “yes”. Same thing with hide childs in chekboxes. Please help me. Really great plugin but can’t use it ??