Not sure, i understand what's your state. I read from the first sentence that the error from the update script went away and you could upgrade; that would mean that ns_cache is apparently working... and then you say, you see the ns_cache error again when you fetch an xowiki page?
When you start the server and invoke then an xowiki page: what is the first error you see in your error.log?
What do you mean by reinstall? a fresh OpenACS installation?
who says, xowiki "rebuilds the cache". During startup of the server, every cache has to be created via ns_cache create.
You started the thread mentioning that you recently witched to aolserver 4.5.1. Are you aware, that this version has a built-in ns_cache? You must not load the nscache .so file in your configuration.
What do you get if you run the url /xotcl/version-numbers on your machine?
