Works fine for me in Lucid... was it a particular component you needed to add to make it crash?
Any chance you could update to Lucid and test again - a newer version of qucs or QT might have fixed the problem.
Let us know what graphics chip and driver (propriatory / open source) you are using, as it might be dependent on that. Often bugs which crash the whole session are down to the X server or video driver being caused to crash by something the program is asking it to draw.
Works fine for me in Lucid... was it a particular component you needed to add to make it crash?
Any chance you could update to Lucid and test again - a newer version of qucs or QT might have fixed the problem.
Let us know what graphics chip and driver (propriatory / open source) you are using, as it might be dependent on that. Often bugs which crash the whole session are down to the X server or video driver being caused to crash by something the program is asking it to draw.
(@rieg: No it should not crash!)