problem in C and C++ connection

[amiroops]

Hi every body, I have a situation here, I have a code in C++ , a GUI and this GUI linked to a C code program which do some calculation, I find out there is something wrong with that calculations, so I put a break point in the line that start to recall the C code and previously when I did that it just expand my C code and I could trace the code, but now it is not working, does anyone have any Idea what's wrong and what should I do?