[linux-audio-user] Muse timing and Rosegarden crashing X

Hello, I've been trying to work with a very large MIDI file (over 420 bars and 50 tracks) and I found some problems with both Muse and Rosegarden (both in their latest released versions). First, Muse seems to go faster in tempo than what is set in the midi file. To test this, I imported the same file in both programs and set both to sync with jack and started playback. After some time Muse was ahead of Rosegarden. Why is this happening? Both are set to the same tempo (I have Rosegarden set to sync to the system timer). Beside this, I found, in Muse, that some notes in one instrument were imported with longer duration. Second, Rosegarden crashes when I scroll horizontally through this large file. It doesn't matter if I do it fast or slow, I just have to keep scrolling for some seconds and then it will crash and make the X server to restart. If I manage to get beyond bar 320, I find that the display gets corrupted and the segment boxes disappear but the midi notes are still being drawn (it looks like the notes keep going outside the boundaries of the segment container). I found the same problem in previous versions of Rosegarden and it's present using two different distro versions (I tested in Ubuntu Breezy and Dapper). So, these problems made both programs unusable for this particular project... I wonder if anyone suffered of the same or have any idea how to solve this problems. Any help will be very appreciated! Thanks! Hector.