What does the command
show? If there's no packet xmgr-semistatic, you probably need to rebuild the rpm database. The command is
and can take some time. You can also install the new package by force:
rpm -i --force grace-5.1.9-2.i386.rpm
(it's not a very good idea, but in such case may be only solution without rebuilding the database).
Edit: and I forgot about the problem with suffix. Yes, that's a good idea. Try the version of rpm -e suggested above first.