errors rendering with 0.8.3

hello,

rendered with this parameter:
acodec=libmp3lame ab=192k ar=44100 vcodec=libxvid minrate=0 b=8000k aspect=%dar mbd=2 trellis=1 mv4=1

output:
Rendering of /media/disk-1/video/111101.schoberstein/kdenlive/hourglass_.avi crashed
[mp3 @ 0x8ff6a20] max_analyze_duration 5000000 reached at 5015510 [mp3 @ 0x8ff6a20] Estimating duration from bitrate, this may be inaccurate
[mp3 @ 0x8ff7c40] max_analyze_duration 5000000 reached at 5015510 [mp3 @ 0x8ff7c40] Estimating duration from bitrate, this may be inaccurate
[swscaler @ 0xa4898580] Warning: data is not aligned! This can lead to a speedloss
[mp3 @ 0xa493f600] max_analyze_duration 5000000 reached at 5015510 [mp3 @ 0xa493f600] Estimating duration from bitrate, this may be inaccurate
[mp3 @ 0xa493fae0] max_analyze_duration 5000000 reached at 5015510
[mp3 @ 0xa493fae0] Estimating duration from bitrate, this may be inaccurate
melt: filter/vertigo/vertigo.c:135: f0r_set_param_value: Assertion `instance' failed.

i tried rending as script and with other parameters as well. allways the same problem.
is this a problem with the vertigo filter? i use this filter massive in this clip.

kdenlive Version 0.8.3 (rev. 671c06e)
(built from build-script on 2011-11-18)

thanx,
johannes.