All other pages are being loaded fine but when I go to permissions page it comes like this. What may be the reason for this ? Please help.
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I had exactly the same problem few days ago. Do you have the devel module install?
For me it was the problem, i can't explain why but when i desintalled it, all worked fine.
So maybe, try to desactivate and unistall it and maybe your page permission will work again.
PS: i just re-install the devel module to make a test and i have exatly the same permission page than you. For me it's the devel module the problem. (I'm new in Drupal so i had certainly make a mistake somewhere)
May be the permission listing makes the memory problem.You have to update the permission listing page to a simple one.
Try the Filter permissions module