Squawkbox and FS2002 -> plane crash

Hi all,I recently installed the current versions of Squawkbox and FSUIPC with my FS2002 installation to start flying online. Got the communication up-and-running, but no flying yet.. The moment I want to start a flight, the simulator shows graphical errors and the plane crashes, causing the simulation to end. When I switch off crash detection, the simulation continues with erratic behavior and it looks like the simulator receives a lot of strange inputs from controls. I have a CH Products Yoke and Pedals, but they worked fine before.If I reboot and start FS2002 by itself, the problem persists... The only thing that works for me is a re-install of FS2002, because I can't find the cause of the problem. However, when I installed Squawkbox and FSUIPC again to try once more, the same problem occured...Anybody have any idea what's going wrong?Kind regards,Rudy