Kic00

Also tried changing the $base variable to the sub-dir of the test blog, /wpmu/ , but that didn’t fix it.

Well, our main URL isn’t our blogs, I guess! We have never had a ‘default’ URL for our blogs — users just get redirected to our www site.

Well, I guess the main URL is for the first blog, then?

But if I login to the wp-admin screen for the first blog, the links still don’t work.

The first blog, which as I said is a test blog, lives at blogs.mydomain.org/wpmu/

What changed in 3.1 for the function network_admin_url?

And again, it all worked fine in 3.0.4…

No, there is no ‘main URL’ for our site.

There is a blog that lives as the first blog, though it’s just for testing, but even if I log in to that blog the URLs are still wrong.

OK, I take it back – the fix to functions.php didn’t work. If anyone has any ideas, I’d love to hear them.

I fixed it by re-activating a plugin that the page needed to render (‘Breadcrumbs’). I shoulda looked in the apache log before posting, but in case anyone else has this problem — add the functions.php file to your theme!