abrt version: 1.1.18
architecture: x86_64
cmdline: python /usr/bin/meld /home/smitchell/adqa/branches/smitchell/scm/tracking /home/smitchell/pub-scm-bin /home/smitchell/adsvc-scm-bin /home/smitchell/wp-scm-bin
component: meld
executable: /usr/bin/meld
kernel: 2.6.35.13-91.fc14.x86_64
package: meld-1.5.1-1.fc14
reason: meldwindow.py:584:append_dirdiff:AssertionError
release: Fedora release 14 (Laughlin)
time: 1305763391
uid: 500

backtrace
-----
meldwindow.py:584:append_dirdiff:AssertionError

Traceback (most recent call last):
  File "/usr/bin/meld", line 137, in <module>
    main()
  File "/usr/bin/meld", line 130, in main
    app.parse_args(sys.argv[1:])
  File "/usr/share/meld/meld/meldapp.py", line 182, in parse_args
    tab = self.open_paths(args, options.auto_compare)
  File "/usr/share/meld/meld/meldapp.py", line 199, in open_paths
    tab = self.window.append_diff(paths, auto_compare)
  File "/usr/share/meld/meld/meldwindow.py", line 630, in append_diff
    return self.append_dirdiff(paths, auto_compare)
  File "/usr/share/meld/meld/meldwindow.py", line 584, in append_dirdiff
    assert len(dirs) in (1,2,3)
AssertionError

Local variables in innermost frame:
dirs: ['/home/smitchell/adqa/branches/smitchell/scm/tracking', '/home/smitchell/pub-scm-bin', '/home/smitchell/adsvc-scm-bin', '/home/smitchell/wp-scm-bin']
auto_compare: False
self: <meld.meldwindow.MeldWindow object at 0x7f88dbbf7450>

How to reproduce
-----
1. trying to compare 4 directories by running meld dir1 dir2 dir3 dir4
2.
3.