Ok, thing I got it.

The problem was that ui_mainwindow.h was generated to ui\folder; while the build system was using ui_mainwindow.h from the project root folder (the old one). Wonder why this even happening?

I had the same issue testing a small app on the simulator, the UI just doesn’t change.
Any easy fix?

You can try to specify explicitly UI_DIR in pro-file. Worked for me at least with desktop-application in similar problem.

mtilli wrote:

You can try to specify explicitly UI_DIR in pro-file. Worked for me at least with desktop-application in similar problem.

ah I’ll try this next time. Similar issue also addressed in this thread [developer.qt.nokia.com]

If you don’t set UI_DIR env variable explicitly,

Check your other build settings. In case of Nokia Qt SDK default setting, simulator’s build setting doesn’t set UI_DIR then use root(but seperated build path) folder’s.