What kind of errors do you get in the debugger?
There is a "cache modification date" checkbox per build target, which could explain why the ide does not detect externally modified files. Are you editing the source files externally, and the ide does not detect that they did change?
And there is a global setting for building before launching, maybe you changed that one.
(I don't have a CW installation on this particular PC, so all names just out of memory :smileyhappy:.
Daniel