Assertion at "import QtWebKit 3.0"

Steps to reproduce

1. Open Qt Creator 3.0
2. Create a new "Qt Quick 2 Application (Built-in Types)" project
3. Open main.qml
4. Insert "import QtWebKit 3.0" at the top
5. Click "Run"

Result
"ASSERT: "QLatin1String(uri) == QLatin1String("QtWebKit")" in file plugin.cpp, line 47". If I click on "plugin.cpp", I get a File Error: "Cannot open plugin.cpp for reading: No such file or directory"

Other notes

• Most other modules can be imported without issue
• Qt Creator's auto-complete knows about "import QtAudioEngine 1.0" but I get module "QtAudioEngine" is not installed at runtime. Not sure if this is a related issue.
• I tried two different builds, but both crashed:
  • qt-windows-opensource-5.2.0-beta1-msvc2012_opengl-x86_64-offline.exe
  • qt-windows-opensource-5.2.0-beta1-msvc2012_opengl-x86_64-offline_2013-11-01_15-23-35-126.exe
• I was able to import QtWebKit 3.0 without issues using Qt 5.1.1:
  • qt-windows-opensource-5.1.1-msvc2012_opengl-x86_64-offline.exe
• I don't have Qt or any compilers in my PATH