I got a strange behavior with an Eclipse installation:  

Even though all update sites are there and accessible, and even though I can SEE in "Install New Software" dialog that there is the new Eclipse Platform 3.6.2.M20110210-1200 I cannot get it installed! Of course it says here that the original request has been modified:

```
Your original request has been modified.
  "Eclipse Platform" is already installed, so an update will be performed instead.
Cannot complete the install because of a conflicting dependency.
  Software being installed: Eclipse Platform 3.6.2.M20110210-1200  (org.eclipse.platform.ide 3.6.2.M20110210-1200)
  Software currently installed: Eclipse for RCP and RAP Developers 1.3.1.20100916-1202 (epp.package.rcp 1.3.1.20100916-1202)
  Only one of the following can be installed at once: 

```

But when I invoke "Check for Updates" it simply says "No updates were found."

Why?? How can I get it to the latest platform release?
Thanks!