I just upgraded my mu install from 2.6 to 2.7, and everything seems to be working fine, except for one blog is acting strangely.
The blog displays fine, as do the pages, but when I click on a category or on a link to one of the blog posts, I receive a 404 error.
One thing I must say is that originally I setup mu to use sub-domains, and after the last upgrade (2.6), I had to reinstall this blog using a path instead of a sub-domain:
i.e., ywamnetworks.com/eurocom instead of eurocom.ywamnetworks.com. So it was the only blog with that weirdness. I even change it back to eurocom.ywamnetworks.com now, but that doesn't help.
Yes, I did put my old .htaccess back, and I went to permalinks and re-saved it so it would re-generate all permalinks. It works fine with the ?p= so I know that's not the problem.
Can anyone help me, please?