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# Known Issues in 4.4.0

An up-to-date list of known issues with Qt 4.4.0 can be found via the Task Tracker on the Trolltech website which provides additional information about known issues and tasks related to Qt.

## Issues with Third Party Software

### X11 Hardware Support

- There is a bug in the 169.xx NVIDIA drivers on certain GeForce 8 series cards that is triggered by the OpenGL paint engine when using QPainter on a QGLWidget to draw paths and polygons. Some other painting operations that end up in the path fallback are affected as well. The bug causes the whole X server to repeatedly hang for several seconds at a time.
- There is an issue with NVIDIA's 9xxx driver series on X11 that causes a crash in cases where there are several QGLContexts and the extended composition modes are used (the composition modes between and including QPainter::CompositionMode_Multiply and QPainter::CompositionMode_Exclusion). This affects the composition mode demo in Qt 4.4, for example. The crash does not occur in newer versions of the drivers.

### Mac OS X

- If a sheet is opened for a given window, clicking the title bar of that window will cause it to flash. This behavior has been reported to Apple (bug number 5827676).