PDF posts no appearing due to security error message

[Bratva]

This error message keeps popping up every now and then

Then when i go into any thread, it doesnt show new posts at all. I have to wait 15-30 mints for new posts to appear in any thread. For example

Can any admin take a look into tis serious issue?

 

[Falcon29]

Deleting site cookies then refreshing gets rid of it.

 

[Bratva]

3 months has passed and issue still persist. Where is the admin?