Bug #56070 Can't click button after setting it sensitive, open 7 years ago and bothering a lot of people in various apps, was fixed today!
The hero of the day is Cody Russell!
Wtf, this bug happened to me and I spent like three hours auditing my code thinking it was my fault!
It was especially annoying when using an internet browser ! I didn't know it was a GTK bug and I've never tried to find if it was already reported !