Finally the bug has fixed and now we can submit the problems !
I am still unable to submit. Page simply refreshes.
I am getting access denied. Admin please look into it.
Same here, that is what the page I am getting back:
"It seems that you were trying to access/edit this page but you don’t have the necessary permissions.
If you were trying to edit a wiki page, you might want to review our policy for granting wiki edit rights. The criterion to gain edit permissions on the wiki is standard - you need to solve at least one contest problem."