World is being hosted on a dedicated 15w35b Linux server. OS is Debian 8 x64. Java is...
OpenJDK Runtime Environment (Iced Tea 2.5.6)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)

Clients connecting to the server are of course also 15w35b mixed OS from Windows 10 to Ubuntu MATE 15.04

I did not test any further. I am assuming a button is a button and what not. Other iron doors placed before I upgraded to 15w35b do work. You can press the button, have a skeleton shoot it with an arrow, all works just fine.

The door will place and show up perfectly on the screen. Pressing the button will make the door noise, but the door itself will not open. Trying to walk though the door after the sound plays will prevent the player from crossing though. Placing the door in survival or creative seems to makes no difference. Hope I covered everything I tested