Using the following QML code in Qt Creator 3.1.1, building against Qt 5.3.0 MinGW 32 bit:

Image {height: 10; width: 10; source: "image.png"; mipmap: true}

Qt Creator marks the mipmap property (added in 5.3 according to the docs) as an invalid property. When loading the view with the code above, the application crashes and logs the following error in the console:

ASSERT: "tdata->isComplete()" in file compiler\qqmltypecompiler.cpp, line 731