I am using Professional Plugin and whenever I create a new repository and click on umr, the editor kind of locks up and I can not do anything. Below is a installation summary.
I did whatever I found on the forum and none of that has helped.

*** Date: Wed Oct 18 11:33:45 EDT 2006

*** System properties:
OS=Windows2000
OS version=5.0
Java version=1.4.2_06

*** MyEclipse details:
MyEclipse Enterprise Workbench

Version: 5.0 GA
Build id: 20060805-5.0-GA

*** Eclipse details:
Eclipse SDK

Version: 3.2.0
Build id: M20060629-1905

Eclipse Platform

Version: 3.2.0.v20060609m-AgOexn6hlEUsvBO
Build id: M20060629-1905

Eclipse RCP

Version: 3.2.0.v20060609m-SVDNgVrNoh-MeGG
Build id: M20060629-1905

Eclipse Java Development Tools

Version: 3.2.0.v20060609m-F7snq1fxia-Z4XP
Build id: M20060629-1905

Eclipse Plug-in Development Environment

Version: 3.2.0.v20060609m------6zXJJzJzJq
Build id: M20060629-1905

Eclipse Project SDK

Version: 3.2.0.v20060609m-GNq6oQq-7es-Y81
Build id: M20060629-1905

Eclipse Graphical Editing Framework

Version: 3.2.0.v20060626
Build id: 20060627-0816

Eclipse startup command=-os
win32
-ws
win32
-arch
x86
-launcher
D:\Eclipse\eclipse32\eclipse\eclipse.exe
-name
Eclipse
-showsplash
600
-exitdata
b1c_8c
-clean
-Xms768m
-Xmx768m
-Dsun.java2d.d3d=false
-vm
D:\j2sdk1.4.2_06\bin\javaw.exe

Please go to File > Switch Workspace > C:\tempworkspace. Hit OK to restart. Now Click File > New > Project, create a new Java Project. Now create a new UMR file in the root of the project. Does it work?

I did that. But does not help. I have bought professional version but can not use UML feature.

Can you go to your log file <workspace dir>\.metadata\.log and look for any exceptions that are occuring and paste them here for me to look at? This looks like an install problem to be honest.