Issue: Broken Island Space Smashes Wiki

This is from my tech guy:

was running vB3.8 - all is good
- upgraded wiki to the new beta version on vB3.8 - all is good after a couple of file edits

disabled wiki, up graded vB to 4.0.2
-> editor is a mess in vB - is something with the wiki, as it goes away and is fine with no troubles when the wiki is enabled -- even though wiki did not work.

upgraded wiki to the newer beta - no apparent problems
-> enabled wiki looked and was there, but no content in any articles ??.

- GREAT - now the editor looks correct again

-> in the admin cp for wiki found it said that clearing the catch normally fixes stuff - so cleaned it --
after this when clicking the wiki link is "Page not found" .. . and the files are there.

restored the database to how they were before cleaning the catch - re did the upgrade, this time it just dont' find the page at all - page not found when clicking the link.

restored the database again - as no ideas -
new wiki files are on the server, the install directory is renamed to "_install"

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Can you shed some light?

Thanks