Delphi Debugger not working

I installed Delphi 10.1 Berlin over a month ago and the debugger doesn't work. I have now installed Delphi 10.2 Tokio and have the same problem. I wrote a simple program by dropping a label on a form and in the form create event placed a single line of code: Label1.caption:='Hello'. I placed a breakpoint on the line of code (a red circle appears) but when I run the application the breakpoint is ignored. Run to cursor also doesn't work. I made sure the program was in debug mode and tried clean and build and still it doesn't work. I have Windows 10 operating system and now have three versions of Delphi on my computer: 7, 10.1 & 10.2 and only Delphi 7 works perfectly. Any ideas why debug is not working? and both 10.1 & 10.2?