Version:            (using KDE KDE 3.4.0)
Installed from:    SuSE RPMs
Compiler:          gcc 3.3.5  
OS:                Linux

If the application is multithreaded a set breakpoint in the thread never get caught.  Also, if it is in the bad mood the debugger gets into a wierd state and you won't be able to start new debugging without restarting the IDE.

In the Project Options I have the folowing addition flags:
LDFLAGS:  -lpthread
CXXFLAGS: -pthread

I've tried all combination of the above flags with no luck.

Here is a simple example just put a break point on the printf in the thread code. Then execute it and you will see it will not break.  Also, if you catch it in the right moment it will render debugger useless.

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iostream>
#include <cstdlib>
#include <pthread.h>


using namespace std;

//void *(*__start_routine) (void *)
void* thread(void* pData)
{
	while(1)
	{
		printf("Worker has started...\r\n");
		sleep(1);
	}
}


int main(int argc, char *argv[])
{
  printf("Starting main...\r\n");

  pthread_t id;
  
  pthread_create( &id, NULL, thread, NULL);

  while( true )
	sleep(1);

  return EXIT_SUCCESS;
}