did u try editing ur timezone on your server ? Do that first if u haven't. Keep the timezone to your personal timezone. It should match the timezone used on the forum for no further confusions.

did u add any new plugins ? If yes try disabling all plugins and check if the same problem persists ?


if even that doesn't work try re-uploading all the non-image files in ASCII mode using ftp like filezilla, that should sort out problems if its related to some permission or similar, make sure to disable plugins - check the forum if it works then try re-enabling each plugin one by one if its a fault with one of the plugins u will know.

Do u have active vb license or is it expired or pirated ? If u have active one, just drop in a support ticket to vb team, they will solve it on their own.