Dropdown doesn't work on mobile touch

[ghost]

When you are using it on Google Chrome for mobiles the selection doesn't work properly. Sometimes the menu is showed up and then fails when you selected it again.

I'm using it inside a paper-material > div.horizontal.layout > div.flex

[intositeme]

I think i am experiencing similar problems.
https://www.youtube.com/watch?v=6aiKXI64py4
The video should show it better.
Using it in
paper-drawer-panel > paper-scroll-header-panel > paper-toolbar > div.middle > paper-dropdown-menu

edited: 15th Sep 2015
Just checked on the Polymer's site demo of it, it's having the same issue.
https://www.youtube.com/watch?v=Ydv4F_uOvjQ

Managed a quick fix by changing line 309 of paper-menu-button from directly calling the open function to using async with a 10ms delay, without any delay in the async the problem persist.
this.async (function() {
this.$.dropdown.open();
},10);

[ghost]

On iOS it occurs when using native WebView (Homescreen-App) and activateEvent='click' on the listbox inside (because the 'tap' event is still leaking). The same issue when using paper-menu instead of paper-listbox. Interestingly the list stays open when using a long touch.

On Safari it works with both gestures for activateEvent.