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Cannot single step into vcl source code anymore

Question: All of a sudden I cannot single step into the VCL source code anymore. The path to $(DELPHI)\Source\Vcl is in the Enviroment Options Direcotry and I also tried to add it to the Project Options > Debug Source Path but it did not help. It appears that $(DELPHI)\ is correct since I added a absolute path to the list and D5 reconized this was the $(DELPHI)\ path and changed it back to $(DELPHI)\Source\Vcl automaticlly. What happened? Answer: Here are two possible reasons for your situation: 1) You may accidentally have unchecked 'Use Debug DCUs' in Project | Options Compiler. 2) Perhaps you have switched 'Build with run-time packages' on.