Your formula is incomplete.
The If Statement requires ( a minimum of 2 arguments)
If TRUE, THEN (with optional 3rd , ELSE)
The OR Statement can have numerous arguments like
OR(Arg!, Arg2, Arg3, Arg4) << with this syntax
let me try it this way.
My statement as written works fine and places the X in cell I10. However I need a third argument that if cell Z10 is empty then I10 also needs to remain empty rather than placing the X.