lately, I happened to move between some gstreamer versions, and most of times, things start to break, even between revs (last was e.g 0.10.10 -> 0.10.4, but it happened on upgrades too). symptoms are crashing applications and applets, maybe complaining about missing sinks. to fix that, all gstreamer dependencies should be rebuilt. something like the following works: # emerge -1av $(for i in `equery d gstreamer | grep /`; do echo -n "=$i "; done) it may be a good idea to put a warning at the end of the ebuild, much like the cups 1.1 -> 1.2 warning.
Please provide more information, I did exactly this on a machine of mine yesterday and had no fallout from apps breaking.