I’m using Qt Creator for several months now and from time to time, I get a problem dragging widgets like buttons, line edits and so from the toolbox to the window.
I try by removing the layouts but still get the same issue.
I use Qt Creator 2.4.0 on OS X 10.7.2
Thanks for helping
I fixed this problem by upgrading Qt Creator to version 2.4.1 on OS X
The solution described above by @spyke might also be helpful for Windows users.
It case there is a dead link, the solution for Windows says :