I've been using SOL on a Lenovo Tab 2A (on Kit Kat), reading it with Opera Mini (latest). The sidetab (to manage scroll etc.) works.
On my new Tab S2 with Lollipop the sidetab doesn't work. When I press it the entire page redraws but the pop-in is not seen. This is both on the full site SOL and the mobile SOL.
Chrome does work.
Any thoughts other than switching browsers?