Apple released the first beta of Xcode 6 on Monday and now all your plugins don't work anymore? This is because of the DVTPlugInCompatibilityUUIDs. Xcode 6 has a new one, so it will not load any of the old plugins by default.

This will be fixed by the plugin authors in the coming days, but if you are impatient and feeling risky, you might want to try this script. It will put the new UUID in all your installed plugins. I've used it, but of course there's no warranty if anything breaks. In any case, there is always

$ rm -rf ~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/*

If you are interested in hearing more about Xcode plugins, check out the talk I gave at AltConf 2014 yesterday.