My projects use CVS as version control.
Until I updated from 1.320 to 1.321 the changelog was created correctly.
But now it is always empty, despite the fact that I can see changes were
detected in the console output.
Example where it still worked, i.e. the Changes link shows all three files:
A SCM change trigger started this job
[BRANCH] $ cvs -q -z3 update -PdC -r Klaus_Branch -D "Tuesday, August 25, 2009
4:21:29 PM UTC"
P build-release.xml
U p2-activate.sh
P p2-install.sh
$ computing changelog

The latest builds won't show any changes, but it is in the console output:
A SCM change trigger started this job
[BRANCH] $ cvs -q -z3 update -PdC -r Klaus_Branch -D "Thursday, August 27, 2009
6:13:12 PM UTC"
P shared-common-tasks.xml
$ computing changelog

BTW: My project is setup for a branch (not a tag).