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).

Edit: the different versions number in the name of the program have some point believe me or not. That is why I have given the all the needed information how to install/uninstall staff in here. While everything got tested basically by at least hundred users, that read these posts, I have put a new version to the repositories. At the same time I have requested uninstalling the older version.