Not a bug Xenforo return blank screen on every page

[gwt78]

Affected version

2.2

Hello,
writing here with the hope someone can give suggestions on this issue and hopefully we resolve this.
Xenforo forum start suddenly gives blank white screen on every one page and status 200 ok.
White screen, no errors, we can't even debug, because when set the debug option to true in the config file nothing happens.
The DB connection seems to be fine because if we change the password to some wrong password, it gives error.
Therefore the connection to the DB is okay.
Any idea would be appreciated.
Thanks!

 

[Chris D]

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