have installed alphamask.dll into paint.net/effects folder. Attempting to use, have followed AWholeCanOfCranky's youtube tute but get to 'copy from clipboard' in doing the alphamask but the option is not available - have invert mask and mix alpha as the only options. running windows 7, 32bit; and paint.net v4.0.9 if alphamask is showing when running paint.net I assume it is in the correct folder ie. paint.net/effects. Are there any other .DLLs required? any and all assistance would be appreciated.