Qt crashes after pressing "Design" button.

SOFTWARE VERSION / VARIANT / LANGUAGE PACK:
SDK_Test_wk10_Qt_Creator_2_5_Beta_testing
Qt Creator 2.4.81
Based on Qt 4.8.0 (32 bit)
From revision ab64c1aef3

PRECONDITIONS OR PREVIOUS STATUS:
Qt SDK installed to desktop. Qt Creator Started. New project is created.

STEPS LEADING TO PROBLEM AND OUTCOME:
1. New created project is in Edit mode.
2. Click on "Design" button to change to Design mode.

EXPECTED OUTCOME:
View should change to Design mode.

ACTUAL OUTCOME:
When selecting "Design", Crash handler is opened. When closing it, Qt Creator crashes. But when some other project is opened (this project was created before), Design button is dimmed and it cannot be pressed.