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1. When testing always ensure that you start the SilkTest Agent before starting your application. so that any external functions get an opportunity to register before they get tested.
2. Please also check that under the Options>Runtime menu in SilkTest, that the necessary browser extension file (*.inc) from the SilkTest/Extend directory is added here as well as the frame file of the application you are testing.
3. This issue has also occurred due to timing constraints. Try including strategically placed Sleep () statements.