Usermin + Proxy Website = No Logout Button

I configured a proxy website in Virtualmin to provide access to Usermin for my clients. Problem is when logging in through the proxy website, there is no Logout button. The only way to logout is to close the browser window. I tried making my own link by adding session_login.cgi?logout=1 to my proxy domain and it works, but the link is simply missing from Usermin. Is this due to a misconfiguration on my part?