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In the Delphi 7.1 VCL IDE Integration Pack for Delphi 8, the Position property of a TForm now defaults to poDefaultPosOnly.
Therefore, if you create a form but did not set the Position property to poDesigned, it is likely that your form will not appear in the expected location.
Changing the Position property to poDesigned will fix the problem.
Learn the command line used to compile System.pas in Delphi