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If you use SetDelayed then you loop will call Abort. With Set (=) res2 has not value at all. You can check it evaluating: a =. ; a = Abort[] (*new cell*) a a So: res = 0; res2 = ""; CreateDialog[{TextCell["Do you want to continue calculations?"], Button["Proceed", DialogReturn[res2 = True]], Button["Cancel", ...

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