Version:           3.0.2 (using KDE 3.2.1, compiled sources)
Compiler:          gcc version 2.95.4 20020320 [FreeBSD]
OS:          FreeBSD (i386) release 4.9-STABLE

Create a C simple "hello world" project. Create an infinite loop:

while(1) {
	printf("Hello, world\n"):
	}

Go to Project->Project Options->Run Options and turn off "Start in external terminal". Press the "Execute Application" button. The executing app does not respond to Control-C. If you try to stop the app by pressing the "Stop" button, kdevelop hangs. The application process shows up if you do a ps -aux in a shell, and if you kill the process manually kdevelop unhangs again.

Something similar happens if you hit a breakpoint when running the debugger from within kdevelop when the "Start in external terminal" option is off.