Howdy! I've just upgraded my WAMP server to version 2.4 running WordPress 3.8 with a few sub-directories running multi sites enabled and others running single installations. I have several databases for development all of which work fine after the upgrade, unless they are multi-site enabled. The issue is I can view the primary admin site from the front end and the backend, when I go to sites from the network menu I can see all the subsites I have created but when I click on them to go to the site I get a 404 error. I moved the databases via PHPMYADMIN dump. I was thinking that might have been a problem but since all the other wordpress single sites work I moved on from that course. I have tested with a fresh installation of WordPress mu enabled, created a site under the admin and I'm getting the same result. I'm thinking a config or ini issue but I am at a loss where to start. Any help would be appreciated.