Debugger not stopping at breakpoints in Delphi 7

Hi, I'm working on a fairly small and uncomplicated project and when I try to debug and step through some code, some of the clear breakpoints I set get ignored. It's strange - *some* breakpoints I set get obeyed fine, but some other just don't. All the little dots are there next to each executable line, and they all seem to be in synch right down to the final "End." statement at the bottom.. but yet some breakpoints work and some don't... it's really maddening. Anyone ever wrestled with something like that before?

Thanks
    Shawn

P.S: It does this just for this particular project. When I work on my other projects, there's no problem with debugging.