I've used Wsecure on a number of sites without any problems at all. In fact it's one of the first things I install on a new site. But I've run into the "can't log out" problem on a site I've recently inherited. The site runs WooCommerce and I suspect the problem is that Wsecure and WooCommerce are bumping heads in the logout arena: as soon as I disable the Wsecure plugin the "can't log out" problem goes away.
To try to fix or at least work around the problem I've tried various permalink structures as suggested by several people here, but none of what I've tried has worked. So I'm hoping that someone who has been successful in solving the logout problem will kindly post their permalink solutions.
Or is there another way, other than removing Wsecure and using another backend obscuration technique (that would be my very last choice: I really like the token key idea and use it on Joomla sites all the time)