forum appear blank page

[NokStar]

All of a sudden my forum giving blank pages when i access forum homepage or any threads.
But addons like vbblogs, vbadvanced etc.. working fine.

Can access Admin CP and it's working fine. I optimized and checked DB using Admin CP maintenance tool and it finished successfully.

Not sure whats the error. Any help plz

[DataHero]

Question: does the white page continuously pop-up, or randomly? If continuously, try re-uploading all non-image vB files.

[NokStar]

continuously coming the issue. I over righted all vb pages. still same.

[DataHero]

Alright, as that doesn't seem to work, try to go through each of these steps to see where the issue rises: http://www.vbulletin.com/docs/html/blank_pages

[NokStar]

Thanks for your reply.
i did all of this and i made a new install of the same vb version (3.8.4 PL2) and connected DB still same prob.

And i tried to upgrade a clone DB of it to 3.6 and 4.05 it hangs in last admin-help.xml process

Any pros here. If you do this i will pay.

[Speysider]

You can't run a 3.8 or older vBulletin on a vB4 database ...