effect stops working after rendering

After having rendered an effect like Q or DeNoiser these effects seem to be dead. I have to quit Wavelab (7.2.1) to get them alive again. Am I doing somthing wrong? What’s the problem here?

Are you using the “Bypass MSection after rendering” option? Look at the small icon with the red arrow, and if disabled, click on it.
Progetto1.png

Marco,

Thank you very much!