attachments popup page is blank
 

Hello guys,

Can someone give me a little help here?

On my forum my users can't post any attachments because when they click 'manage attachements' a blank page just appears.

I've checked if the newattachment.php is in my web root and it is.
So why does it show a blank page?

Please can someone help?

Thanks,
Tim

EDIT: Recently I installed the mod_pagespeed in my server and this happened since there. I tried to disable mod_pagespeed and the issue disappears, so is a conflict.
Does anyone know how can I fix this issue with mod_pagespeed working please? Thank you!

--------------- Added [DATE]1453977463[/DATE] at [TIME]1453977463[/TIME] ---------------

Ok, I already disabled mod_pagespeed in my vbulletin forum.
But now I have a new issue... When I read new posts doesnt mark as read, always appears as read

What can I do to solve this issue? Thanks!