This was a bug that was fixed in 6.2.0
One solution is to add the following javascript snippet to the page:
window.onload = function() {
var links = document.getElementsByTagName('a');
for (var i = 0; i < links.length; i++) {
links[i].innerHTML = links[i].innerHTML.replace('&','&');
}};
But I wonder if anyone has a more clean solution.