Okay, KDE_DEBUG=1 was set. I ran rosegarden (from /usr/bin) first with
2> then with > and below are the respective outputs (problem.txt is 2>)
Tired of bloated software which gobbles up your system resources?
Bored of hearing your harddrive being thrashed by inefficient code?
Feel like tearing your hair out when you see a blue screen of death?
Then why not come over from the darkside, and become one of the ever
increasing number of people using Linux - it's free, it's open,
it's easier to use than Windows and more reliable as well.