Cloned forum/database changing bburl of one affects both - what's going on?

[SToP_GAP]

Those settings were all at / or blank (on both versions).

I should add that the original forum is being accessed via a domain which points to the server, the other is accessed directly from the IP of the same server. These are set to point to different places on the server and I confirm that this is working as I can load scripts with the same name but different output via both URLs. I have moved the test site into a sub-folder in its original root and updated paths accordingly (including cookie path). The exact same issue happens again however - When I set the cookie path or any setting it seems for one site, despite retaining the correct data, the other site ceases to load.

When I came to this setup there was originally the configuration I'm trying to achieve in place but it broke when I tried to run the upgrade scripts on the test site (this was v4.1.1 not 4.2), so it definitely has worked in this scenario before...

It feels as though there's some clash somewhere, possibly some oddness with a cache? I'm trying from different browsers with all cache cleared, xcache is off on the server as I said... I'm very confused!

--------------- Added [DATE]1354110188[/DATE] at [TIME]1354110188[/TIME] ---------------

I've just noticed that when I first log on, both are accessible just fine most of the time. However, when I do, the Forum Name (bbtitle) set on the original site is being used on the cloned site's pages, even when the options and databases show different settings to each other.

I can only assume that somehow the data is being mixed up, but it's very strange as it's only some data. I was able to change the text of a notice via the admin panel of the clone site for example, and the message remained as it should on the original site and remained changed on the clone site. Setting this did not cause either site to become unavailable, so it seems to happen when options are set.