Man this is the fourth time during my current project that when reopening after a crash I get the message:
"Replaced wrong clip producer producer0 with 176"
- where 176 can also be another number. Can anyone explain why this is, what this is and mostly to what degree I should be scared?

Usually I update to latest SVN version so this project was made with several versions. Included is a projectfile last crash/saved with rev 4251.
I haven't been able to willingly reproduce the bug but I've tried to isolate some information on a really bad crash in bug #1308, which produced the same error. Maybe it's useful.
http://www.kdenlive.org/mantis/view.php?id=1308
*due to the 1 MB disk quota I can't attach the projectfile and have (mis)used bug 1308 for that. The projectfile is called RunWithTheWolves_producer0.kdenlive
**After all this now I've actually managed to get projectfiles that are non-openable (at least on my computer)... Probably due to me stacking effects because that's what I've been doing last. I will file a bugreport with some backtraces etc. after I get back on track.