My clients are not redirected properly... they get a 404 "page not found" error
You should Update your Permalinks
Please check your Permalinks settings, and if not already, please change to "Post Name"
Even if they are set to "Post Name", go ahead and re-save to reset.
Check your Theme Link Pages
Additionally, you will want to verify that all of the WP-Client Theme Link Pages are correctly installed and linked in WP-Client-->Settings-->General-->Theme Link Pages (You should see green checkmarks next to all of the boxes)