I had problems to start QTCreator probably because of an bad update. So i decided to uninstall the whole SDK.
The SDK was installed under: ~/Development/SDKs/QtSDK
I stored my Projects at: ~/Development/<my company's name>/
And other Project had been stored under: ~/Development/
After the uninstall all files in ~/Development were gone just some softlinks were not deleted...
I executed: SDKMaintenanceTool.app/Contents/MacOS/SDKMaintenanceTool
I'm able to reproduced the bug...