Debugging C code Call Stack Line

["lovedr" < >]

Hello:

I am having the same problem where the NB stops at the line right before the 
main function with a little gray trianlge. placing the mouse over it says 
that its a "call stack line". not sure what that means. in the stack window, 
there is nothing, in the sessions window, it says 
Name               ProcessID            Process State                       
Host
MyAppName    -1                          Exited                               
      localhost

I can not figure out why this is happining. in other projects it works fine. 
please help I have been dealing with this problem for 2 days now. any help 
would be grealty appreciated.  also, there is no core file in my project dir. 
Im using CentOS linux and my project is a C/C++.

Please Help!!
Thanks