Eclipse Ganymede J2EE plugins

I noticed that I have problems installing plugins after I restart the Eclipse (Update Manager changes) so i have to install them all in one shot without restart:

SVN:

http://subclipse.tigris.org/update_1.6.x

Google AppEngine:

http://dl.google.com/eclipse/plugin/3.4

Maven2:

http://m2eclipse.sonatype.org/update/ 

I actually had to delete the eclipse folder and expand it from the tar, then I install all plugins each time saying NO to restart of Eclipse. After the last plugin installation I restart the Eclipse and all works fine.