[news.eclipse.platform.rcp] incomplete automatic(silent) update in eclip

[none2love@xxxxxxxxx (bonobono )]

Hello,

Users of my plug-ins want very strict & enforcing update policy.
So, I implemented automatic (silent) update function to my plug-ins,
During eclipse start-up, it checks user-defined update URL stored in 
preference, and if any update exists, force updating without any 
confirmation. Then alert ?reboot required?.

http://dev.eclipse.org/newslists/news.eclipse.platform.rcp/msg05356.html
I used almost same mechanism referred at link above.

Anyway, It has worked very well in eclipse 3.3.

But in Ganymede(3.4),
it also try updating, and it seems that all updating process has finished 
well.
But it do not finish updating completely.

The Symptom is?
- All feature & plug-in files for updating (.jar format) has been 
successfully downloaded at proper location.
- But, after restarting, eclipse still launches with old version. (Nothing 
has been changed!)
( I tried ??clean? option, but it was in vain.)

I know there are another method using changed update mechanism (P2).
But, I heard that old update method is still valid in 3.4.
And most of all, I want to solve this problem under existing update method.

Do anyone know there are another necessary task to complete updating and 
to register already-downloaded plug-ins to eclipse 3.4? Or is there any 
suspected point?

Thanks.