I have a Enthought Traits/UI GUI application with several Int traits. I find that all of these allow me only one access, after program start. That is, I click in one of them and am allowed to edit the value, but just once. The next time I try to click on the Int, it's unresponsive and I can no longer edit the value.
I was able to solve this, by switching from the wx to the qt4 backend.