Well, it depends, for example, there are to different packages: gstreamer-tools and gstreamer-tools-0.10, they are widly used, no one complains.
Well, that means you have few versions of the same software installed, if you have read the first post in which I explain step by step what is happening with every new version and what you should do in order to uninstall it and install properly newer version, you would not get any problems what so ever. So please, anyone who has some problems check first the first post (which is in fact something like 2 A4 pages long, so all the possible information is there).