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RonaldK thank you very much for your advice, I have updated to Delphi 10.4.2 and the problem has been resolved. What I don't understand is that, every time a new version of MacOS appears we will have to recompile our application, this does not happen with Windows, I have an application compiled in 2001 that continues to work perfectly today, without the need to recompile. It forces us to buy MAC machines every so often and to pay for compiler updates. Again, thank you very much for your advice.

Then is a problem only with new version of MAC OS? do you said that if I execute the code with MAC OS Catalina the problem not exist? Thanks.

I am developing an application for MAC OSX 64 bits, using Delphi 10.3 and macOS Big Sur, I run into a problem trying to catch exceptions and I cannot find the solution. When an exception occurs the execution cycle does not go into the Try / Except, it seems that RTL gives an error when performing the Raise of the Exception and triggers a new 'Access Violation' exception that goes into a loop. Below you can find the test code that produces the error: Unit8; interface uses System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants, FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.Controls.Presentation, FMX.StdCtrls; type TForm8 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; function Str2Float(str : String) : Extended; var Form8: TForm8; implementation {$R *.fmx} procedure TForm8.Button1Click(Sender: TObject); var f : extended; begin f:=str2float('10,7'); ShowMessage ('Resultat : '+floattostr(f)); end; function Str2Float(str : String) : Extended; var dec : Char; begin result := 0; if length(str) > 0 then begin dec := FormatSettings.DecimalSeparator; FormatSettings.DecimalSeparator := '.'; try result := strtofloat(str); except on e : Exception do begin FormatSettings.DecimalSeparator := ','; try result := strtofloat(str); except on e : Exception do begin result := 0; end; end; end; end; FormatSettings.DecimalSeparator := dec; end; end; end. Thank you very much for the help