TTworkbench: What to do when the parameters in the parameter view in excution perspective cannot be modified?

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TTworkbench: What to do when the parameters in the parameter view in excution perspective cannot be modified?
1. Close TTworkbench 2. Remove the following C:/Users//.eclipse under Windows, or %HOME%/.eclipse under Linux 3. Remove the TTworkbench installation directory (equivalent to uninstall) 4. Reinstall TTworkbench in default directory - C:/VIAVI under Windows. Reinstall the plugins/TTsuite if any. Attention: DONOT install it into C:/Program files directory under Windows