https://www.bayonnais.com/board/viewtopic.php?t=13475
the server response return
before that any output is sent, and before the redirect, that should be done by the JS header code, when is detected that the page is not inside the WP page iframe.Failed to load resource: the server responded with a status of 500 ()
You can also test this, if you do not want to force phpBB to load inside the iframe, and test:
Comment the line, into the overall_header added code
Code: Select all
document.location.replace(href0);
Code: Select all
//document.location.replace(href0);
then open the forum to the real url, and it will be loaded not inside the iframe.
And you'll get the same error 500, and blank page.
Cannot imagine at moment from where it could come out, but since others pages works, i assume it is a problem you created into template files? (if you changed it).
There is some extension that could interfere?
Overwrite/upload again the file viewtopic.php and the related template file so to assure that it is not corrupted?
Disable and test