grid not loading after sc_redir()

hello, im having a probelm with my grid, i acces my grid through another application that gives it some parameters to load all the fields and it Works fine.
in the grid i have a button to return to the previous application with sc_redir, and that Works fine too, but when i go back to the grid again it doesnt load anything it shows an empty grid with no fields and just the buttons, any ideas of what might be happening?