Bug White pages on setting change

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vBulletin 4.2.x
Hello, I am having the white page problem when I try to make changes in admin to vb optimise (and the changes don't take effect). I have ran the test php 1 and 2 and it returns Working! Does this still point to a configuration issue of XCache?
I just installed this, and enabled xcache as my opcache operator, but can't change any settings or globally turn off vb optimise.

edit: oh and the test setup completes except for the flush cache, which seems to just sit there.

I have enabled display_errors in php.ini and put in @ini_set('display_errors', true) in my config.php file but am not getting any errors on the white pages.
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Solved it, "xcache.admin.enable_auth="Off" " in server settings. I guess if that says yes, then things wanting to use it HAVE to authorize... Since VB optimise wasn't set up to.. it couldn't so it wasn't working.
Maybe that will help someone else later on :p
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vB Optimise

vBulletin 3.8.x vBulletin 4.x.x
DragonByte Technologies
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