In the following very basic example the switch works and is styled properly. If I merely change the foundation.css version from 5.5.2 to 6.0.5 the toggle style is lost. Why don't switches work in Foundation 6.0??? Again, just change the style sheet to "https://cdnjs.cloudflare.com/ajax/libs/foundation/6.0.5/css/foundation.css" and it stops working.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Foundation Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/foundation/5.5.2/css/foundation.css">
<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/foundation/6.0.5/js/foundation.min.js"></script></head>
<body>
<div style="padding:20px;">
<div class="switch large">
<input id="mySwitch1" type="checkbox">
<label for="mySwitch1"></label>
</div>
</div>
</body>
</html>
Foundation has changed its naming scheme slightly in version 6.0, so you would need to update your HTML to match that. See the documentation here:
http://foundation.zurb.com/sites/docs/switch.html
<div class="switch large">
<input class="switch-input" id="largeSwitch" type="checkbox" name="exampleSwitch">
<label class="switch-paddle" for="largeSwitch">
<span class="show-for-sr">Show Large Elephants</span>
</label>
</div>