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debuger graphical display problem

I need display integer and float data from TASK. After run Animate I can see refreshing data in Watch window, but on Graphical Display I see only blinking zero line. I am sure data is nonzero, I see it in Watch window. I set up 2 breakpoinst: first actions refresh watch window, seconde refresh Graphical display, both red point blinks. What is wrong, why Graphical display refresh zero line?