Hi, here's what I want to do: There are 2 (very simple) VIs which I want to call with a subpanel in a tab control of a main VI. The first VI has a slide going up, the other one going down. When I run the main VI only one (the initial one) of the tabs responds according to the subpanel with the respective sub-VI. What is the problem? Regards

I placed the sub-VI calls outside your main loop and deleted the inner loops. I saved it again for LV10.