I have the same situation as the one described by Maher in the latest announcement (announcement for RC2).
However I am not able to follow his instructions (delete MyEclipse install/eclipse/.config directory since I don’t have that directory at all, but the MyEclipse extension is not loaded after Eclipse starts up).
I have a pristine Eclipse 3.0M6 installed in c:\apps\eclipse-3.0m6 from the zip file (not overwriting a previous version, but installed into a new directory).
I have installed MyEclipse 3.7RC2 in c:\apps\myeclipse-3.7RC2 (a newly created directory created by the MyEclipse installer during installation).
OS is Windows XP Professional.
I have Sun JDK 1.4.2 (java full version “1.4.2-b28”) in c:\jdk1.4.2.
JAVA_HOME is set to c:\jdk1.4.2
javaw loads from c:\jdk1.4.2\bin
I am logged in with a user who is in the Administrators group on the machine.
I had a 3.6.4 installed into 3.0M4 under a different eclipse install directory, but it was uninstalled and the uninstaller told that it has been uninstalled successfully. I had not rebooted since the uninstall.
Eclipse starts up without a problem, in the configuration management I am able to see the MyEclipse 3.7RC2 extension with directory c:\apps\myeclipse-3.7RC2\eclipse. It is in enabled state.
I also tried disabling (with restart afterwards) and enabling (with restart afterwards) the extension, but it resulted in the same situation (Eclipse started without a problem, but MyEclipse related things don’t appear).
The c:\apps\myeclipse-3.7RC2\eclipse\.config directory never gets created.