GL_ATI_pn_triangles problem

I have just started using the above extension. My test display function draws one triangle with GL_PN_TRIANGLES_ATI enabled in CUBIC/QUADRATIC vertex/normal mode. Each call of the display function results in the program consuming more memory. If I do not enable GL_PN_TRIANGLES_ATI everything is as normal with a stable memory usage. Have some of you encountered the same problems? The PN triangle renders as expected.

Facts: System is WinXP Home, Radeon 9800Pro, Cat 3.8 drivers. All extensions are successfully initialized, and my tesselation level does not exceed the max value.

Any help is much appreciated.

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