I tweaked the pop-up menu position to work with android, but position still isnt working with iphones. If you can please check your mobile layout compatibility w/ the new iphone 6plus too please..we are getting user complaints on bad/ugly format on their devices

Just a suggestion, why don't you position the Sign in button in the center instead. This is a really tricky situation because the element will actually appear centered underneath your element (in this case underneath your sign in button)

It is in the center module position actually (see attached). Why did it work fine in 1.x but now not 2.x?

On 1.4, it was probably running on the collision detection system which is extremely heavy as the javascript needs to calculate a lot of various positions before outputting on the screen. We took it off to speed up the site.

What I meant was this, http://take.ms/XVxpS

How is that accomplished?