midnightcoder

Could you link or name which XML sitemap generator plugin works well with Multisite please?

I had to give up the one you had issues with on several sites, but it’d be nice to have a replacement (at least until the author of the problematic one updates his).

The last thing you said, just rename each copy of the theme. There’s probably more elegant ways of doing this, but this works and is quick/easy, especially if the sites are just for your use.

When viewing the themes page, you’ll be able to see which is which by the line:
All of this theme’s files are located in /themes/[yourthemename]

Not to be unkind, but if you continue using 2.6 it won’t matter what plugins you use, when the site gets defaced/exploited by any of a number of easy exploits. Your host won’t care for you much either if your site gets used to send out bulk spam.

Seriously, the responsible way to run WordPress is to keep it updated, fixing or replacing your plugins along the way.