Cannot single step into VCL source code anymore

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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.

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