Hello and Welcome to LQ !
It seems that you have installed the new xmms version "in addition" to the one that doesn't work.
I would suggest that you remove the new one "rpm -e xmms-new-version", and then upgrade the old version.
i.e. instead of installing xmms using "rpm -i xmms-new-version" (which I assume is what you did, please correct me if I am wrong), try installing it using "rpm -U xmms-new-version"
This should upgrade your xmms, and have a single copy of it on your system for all users to use.
Hope this helps.