Thanks for those boxes Rick. I think my problem is a bit more fundamental though. I can't get any change at all in the Thesis design to register on my multisite MarketPress shop. The shop seems to be finding a styling from somewhere which is overriding what I am telling it to do via Thesis. I'm not sure where to begin in discovering where the rogue style is coming from or why it's there. 

Does anything spring to mind?

Thanks as ever

Doh! Thanks Rick - a case of me not having RTFM properly.

So I've done that - adapting the .htaccess file as it suggests and uploading it, and hey presto the shop site is taking the correct design - which is brilliant.

BUT it's created another problem. I am now unable to login to the shop's dashboard because of a "redirect loop". Getting into the network admin dashboard is fine, but not the individual shops. 

So here are some links:

The dashboard for market.wansteadium.com works fine (that's the network admin dashboard)

But the dashboard for market.wansteadium.com/thewansteadtap is now unavailable.

I'm guessing I need to put in another line of code into the .htaccess file...?

I've got it working fine now - thanks to the DIYThemes article you mentioned and help from WPMU. 

http://premium.wpmudev.org/for.....ost-594127

You're right, it is a bit tricky to set up but now seems to be fine.