Can't open paper-menu in acceptance test

I've been upgrading to the latest version of ember-paper (alpha 16) over the last week. It's gone fairly well. However all my tests that were running previously using paper-menus are now broken.

I've paused the acceptance test right before it is supposed to click on a trigger to open a paper-menu and I have tried to click on it directly. I don't get any error message, but they just won't open.

I've looked in to the ember-basic-dropdown which it's based on and tried his helpers, but still no luck.

Wondering if anyone else has seen this, or knows how I could resolve it?