I'm running 0.8 on 64 bit Ubuntu 10.10.

When I try to open up a project, Kdenlive gets stuck at the 50% mark and remains there for hours (at least 2 hours anyway). There's very little in the way of CPU or disk I/O activity during this time.

My project references 4 MOV files totaling about 25 GB.

Here's the most interesting stack trace:

(gdb) where
#0 0x00007ffff586a285 in pthread_join () from /lib/libpthread.so.0
#1 0x00007fffcd82d2be in SDL_WaitThread () from /usr/lib/libSDL-1.2.so.0
#2 0x00007fffcd824eca in SDL_AudioQuit () from /usr/lib/libSDL-1.2.so.0
#3 0x00007fffcd8243b5 in SDL_QuitSubSystem () from /usr/lib/libSDL-1.2.so.0
#4 0x00007fffcdab6600 in ?? () from /usr/lib/mlt/libmltsdl.so
#5 0x00007ffff7bce487 in mlt_consumer_stop () from /usr/lib/libmlt.so.4
#6 0x00000000004bb979 in Render::setSceneList (this=0x11798d0, playlist=DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjuction with DW_OP_piece or DW_OP_bit_piece.
) at /build/buildd/kdenlive-0.8.0/src/renderer.cpp:984
#7 0x00000000004d3626 in KdenliveDoc::setSceneList (this=0x15626c0) at /build/buildd/kdenlive-0.8.0/src/kdenlivedoc.cpp:307
#8 0x00000000004f9c6b in TrackView::TrackView (this=0x15a9180, doc=, ok=0x7fffffffcdcf, parent=) at /build/buildd/kdenlive-0.8.0/src/trackview.cpp:111
#9 0x00000000004723ae in MainWindow::doOpenFile (this=0xca3560, url=..., stale=) at /build/buildd/kdenlive-0.8.0/src/mainwindow.cpp:2031
#10 0x000000000047c02c in MainWindow::openFile (this=0xca3560, url=...) at /build/buildd/kdenlive-0.8.0/src/mainwindow.cpp:1988
#11 0x000000000047c398 in MainWindow::openLastFile (this=0xca3560) at /build/buildd/kdenlive-0.8.0/src/mainwindow.cpp:1945
#12 0x000000000048057d in MainWindow::qt_metacall (this=0xca3560, _c=QMetaObject::InvokeMetaMethod, _id=-512, _a=0x7fffffffd270) at /build/buildd/kdenlive-0.8.0/build/src/cmake_bindir/mainwindow.moc:380
#13 0x00007ffff6fb0b27 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4

How can I fix and/or debug this?

A quick search seems to indicate it is a gcc bug (the c++ compiler), see:
http://stackoverflow.com/questions/3721097/gdb-error-message-dw-op-reg-dw-op-piece-and-dw-op-bit-piece

What is the output of:

gcc --version

I fixed this problem by upgrading all of the packages associated with MLT from 0.7.0 to 0.7.2.