Same problem with facebook login plugin, first login is ok, after logout I can't login via FB or just Login into chevereto as admin account or just as user.
1) Login into FB from laptop/pc.
2) Take your smartphone, login to album.az via FB.
3) Logout from laptop/pc.
4) Logout from from album.az
5) Login to album.az from smartphone (not work) the page just refreshing.
After erase cookie FB login works stable. This issue relate for many users. And they can't normally use FB login to upload images. I can't tell to all to erase cookie.