Cannot set Build Environment to Ubuntu Trusty 14.04

It keeps reverting back to ubuntu 12.
There is not ‘save’ button on the page for setting the Ubuntu version.
I have tried submitting builds while sitting on the Build Environments page, but it keeps building with 12, even when the checkbox is set to 14.

Anyone know how to make the choice stick?

Switch to 14.04 finally stuck on 5th push.