Profile icon not changing after migration

I am facing a wierd problem. after migratng to server, I founf many data floder permissions changed to 700 which caused many profiles blank without any image.

when i changed folder permissions to 755. pictures returned back, except for few.


Also a wierd problem arised Users ar enow unable to change profile pictures. After selecting image upload words fine. elgg notifies upload sucessful, but profile icon do not get updated with new image. 

I tried using upgrade.php many times. disable chache. but nothing worked.

Please tell soluiton for this problem


I am using Elgg 1.7.8



Adding to probem, when i activate plugin bulk user admin, in user administration user list is not provided only link for pages qith delete checked option