Property Editor dropdowns need 2 clicks

Ignition 7.5.2
OpenJDK Java 1.6.24
Ubuntu 12.04 64-bit

Sun Java 1.6.26
Ubuntu 11.04 64-bit with Gnome

When I click on a dropdown list in the Property Editor (Horizontal Alignment for example), the list appears then immediately disappears. I have to click on the dropdown arrow a second time before the list stays on the screen.

Thanks, we have a ticket in the system to have it fixed.