There is an error happening (maybe conflict with another mod) and you have error reporting turned off. You can check your server logs for the error message, or try to override in showwiki.php. Find:
Add before:
If this doesn't show you an error message then you might not be able to override the directive for 'display_errors' at this level, or the white page might not even be caused by an error.

Just incase people want to know, this mod breaks VB 4.2, posting replys in threads will give you a white page with this mod on :)

Yes, but at the moment there's no 4.2, not supported one. :)

And yes, if you check authors site, they already are on 4.2 and are testing VW with it. It will need some changes to work with 4.2, but it will be done.

Pegasus has already said 3.0.19 of VW will support vB4.2.x
https://www.vaultwiki.org/articles/107/

He has the VW site running vB4.2.0beta1

I would hope to see a VW release very soon after vB4.2.0 GOLD.

VaultWiki 3.0.19 with official vB 4.2 support was released about an hour ago. I am going through it now and incorporating the necessary changes into Lite. Shouldn't be too long, a couple of hours.

VaultWiki Lite 3.0.11 is now available, which *should* work with vBulletin 4.2. Let me know if you have any problems with the wiki tab.

Updated 3.1.19 in both 4.1.12 live and 4.2.0 test -- all ok

Updated my Lite site to 4.2 and re-upgrade VaultWiki Lite. Needed some tweaks but now it's working correctly and the ZIP is updated.

Enjoy moving your wiki tabs around.

Is there a fix for this for the vB mobi theme? The forum display of the Wiki enabled forum is all out of place.

Only the full version has support for vB's mobile style. I will have to make it turn off the mobile style in the wiki forum list if it looks that bad.

You might be able to get around it yourself by setting a forced style in the wiki forum, under that forum's settings.