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The dxCreateScreenSource function creates the screenSource element. (it can fail if there is not enough video memory, which results in returning the value false instead) Important: Elements can't be directly saved inside variable, a variable can only point to an element (see userdata). Thus overriding the value of variable screen, does not delete the previous element. Which leads to a memory leak. Recommendation: The screenSource texture element should only be created ones at the top of your resource. Or you can do something like this: if not screen then screen = dxCreateScreenSource(sx, sy) end -- of not exist, attempt to create the screenSource texture if screen then dxUpdateScreenSource(screen, true) end -- if exist, update the screenSource @Korea (If you want to me to update your current example, feel free to ask below. Also this topic might be better of at scripting > tutorials, but it is your choice. )