Weird it’s only happening in v5. Are you htaccess rewriting anything? If so, remove it for now and make sure you’re including index.php in your urls. If that still doesn’t work, see if including the ? in your urls matters?
So something like http://localhost/exp5/index.php?/blog/entry/the-one-where-we-shake-it-ff
After that, might make sure you’ve got php errors showing for everyone, disable any extensions, turn on debugging and see what EE is doing behind the scenes.
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