I ran into same issue. If you browse the iso/cd of the 2.5 install. Browse to the vpx folder, and run CapacityPlanner.exe. Once it's done installation, you will need to reboot virtual center.
I performed the action you described above, but did not solve my missing Consolidation button problem, did you manage to get this resolved?
I opened my VI client on my notebook to the virtual center server, then followed the process of installing the VMWare Converter Enterprise plugin, and enabled it. Seems it must be done for every VI client connected. but also it do not work!
Go to c:\Documents and Settings\All Users\Application data\VMware\VMware VirtualCenter\
and remove the following lines from the vpxd.cfg file and rebooted the server.
Thanks, wonder why I did not find that vpx.cfg file
this solved the problem.
But analysis is still not working, cause vc-server is a german-install and guided consolidation is only working on englisch OS-version. I don't know why the programmer does use fixed pathes instead of OS-Variables like %WINDIR%.
You do not need to reboot the server, restarting the vc-service is enougth.