I have done the following on allegra and rosalba:
[root@allegra caltech]# yum install glade2
On rosalba the matplotlib was out of date with respect to allegra. I have no idea how the version 0.98 on allegra got there, but I left it. However I updated rosalba to the epel version
1 yum remove python-numpy
2 yum install python-matplotlib numpy scipy --enablerepo=epel --disablerepo=rpmforge
This is all to support the LIGO data listener which now has a shortcut on rosalba and allegra's desktop. It seems to work for (live mode) right now.