LeonidS  Might you have any hints on why this login button works fine on the site on my laptop with all browsers. On my Android mobile it works fine if I go to the site thru a browser.  When using the Android mobile app (1.5) the join button works fine and brings me to the join form. 

But... When using Android mobile app 1.5 the login button just flashes back to the same page that I started from and not the login page.