styleid conflict

OK, I think I know what's happening with this but I need a bit of clarification and help to fix it.

I've set up a new style set for my boards with the styleid of 2. However when I browse back to my main, PHP based, site the pages fail to load.

I have VBulletin set up to apply its cookie sitewide so I can call user info into my non-vb pages, but it seems the styleid in the cookie is conflicting with the styleid when coming from the forums.

The easiest way to see what I mean is to go here:
http://www.wickedcolors.com/wkdboard....php?styleid=2

and then browse to a non-forums part of the site.

Have I figured this out correctly?

Secondly, how can I prevent the conflict?

Would swapping the styleid's in the db do the trick (or is that asking for trouble)?

Is there a way to set the styleid to 1 when a user exits my forums or enters a non-vb page? Obviously that would also mean I would need someway of setting the styleid to 2 when a user enters the forums.

Blimey this is creasing my head.

All help and suggestions gratefully accepted.

Cheers

[Admin]

Make sure that any custom templates you are using are also present in the newely created style.

[culprit]

Yeah, all custom templates have been included in the new style.

Do the replacement sets have to be the same as well?

[Admin]

If you are using different replacement sets, yes.

[culprit]

Replacement sets now match, but still no joy yet.