Thanks for confirming the target issue, and good to know it’s in the queue.
As for the CSS/JS issues, I’ve managed to pin down what appeared to be the random behavior to something specific and repeatable. I don’t have a public page of my own to point you to, but the same components are also used here: http://portfolio.bixie.org/portfolio
If you visit the page with 56.06b and toggle to responsive mode with touch enabled - then click an image in the portfolio section to open an image slider as a lightbox… you’ll get the expected behavior at first. Now toggle the touch control to turn it off, and you won’t get the backward/forward arrows for the ‘desktop version’; and obviously, touch/click no longer works. The only choice is to close an image, open another, close, it, etc., since there’s no slider controls or a slideshow script to auto-play or to toggle one on.
Now toggle responsive mode off to get back to desktop mode… and most likely there’s still no arrows if you go through the same steps. You’ll need to manually refresh the page to ‘reset’ all the toggles. It also won’t matter what device emulation you choose… they all produce the same series of problems.
Going through the same set of steps in FF 55.02 w/DevTools enabled gives all the expected responses, albeit not in an ‘automatically refreshed’ way since it won’t reload the page when first toggled into touch mode by default.
I haven’t gone through the script/CSS to verify there isn’t some errors within them that’s causing these problems, as I’m not the developer - but - if there’s a coding issue there, wouldn’t 55.02 also show the same type of issues? It all seems tied to responsive mode’s code in the Dev Edition.