Issue: bbcode issues

This is not actually a bug. You have BB-Code, images, etc all disabled for the wiki index. See VW CP > Settings > Content Types > Wiki Index Options.

Note that there is another bug, so I leave this open: if you update this setting (or any area settings similar), the affected pages are not removed from the parse cache. Luckily, the parse cache is still disabled because we knew there were unresolved issues like this.

After turning that on, there are less issues. The page barely loads though.
IMG does not load.
noparse does not work. (See other report)
table does not work (see other report)

I can confirm that the IMG tag is disrupted when used in wiki pages under XenForo. It appears that the protocol is added to the front of the URL even if it already has one.

NOPARSE doesn't exist in XenForo. However, the importer is supposed to convert those tags to PLAIN automatically.

Your usage of TABLE is either the vBulletin TABLE BB-Code or some other third-party version (I believe we've discussed this in the past). VaultWiki's TABLE BB-Code uses a different syntax, so your existing uses won't parse correctly. You either want to disable VaultWiki's TABLE BB-Code from the Syntax Manager so you can implement your own solution, or you want to update your uses of the BB-Code.

If the impoorter already imports noparse as plain, then please disregard. I will need to check if there is an issue. It may just be a matter of copy-pasting.

Regarding the table bbcode: as VW does not offer legacy support for my vb3 tables, I will need to use the datatables addon.

I see the BB-Code tag translator was disabled in the VW3 importer for some reason. This is fixed in the next release. I suspect you will need to run the import again anyway once you figure out where your images went (your live site can't even find them).