Try this and please tell me if Construct works:
Start of app -> Button: set text to "Hello"
result: nothing! (the button mantains OK default text).
On button clicked -> Text: set text to "Bye"
result: nothing! (the text object mantains "text" default text).
On button clicked -> ComboBox: Add line "Oh my God"
result: nothing! (the combo box remains empty).
Now, Scirra, I can not imagine why release a non working version when the last release of Construct I remember (was #11) was incomplete but surely better than this waste-time stuff.