I have just upgraded from Hudson 1.65 to 1.76, and noticed that
the subversion polling behaviour has changed. We have several projects
that use one subversion repository, and when I change one project, all
the other projects are rebuilt too. It looks like the polling now just
looks at the overall repository revision number, and not if there are
any changes in the subdirectory.

one project uses this subversion site:
https://CENSORED/mas/koagent/trunk

another one this:
https://CENSORED/mas/ensure4j/trunk

Hudson uses one subversion user that has readonly access to the whole
repository.

On the server we use subversion version 1.1.4 (r13838).

When I commit something to https://CENSORED/mas/koagent/trunk (new
revision is 18576), ensure4j is rebuilt with the following message, even though
there are no changes in ensure4j, the revision number of the last change is 18574:

Started on 30.01.2007 18:06:13
Revision:18576
Done. Took 0 seconds
Changes found

I have exactly the same message in all of my projects. Same date, and
same revision number.