quiet-time timer not working

We have 20 or so projects configured in Hudson. We use a combination of CVS
polling (each project polls CVS once every 5 min, although not all projects at
same time), and forced nightly build (around 3AM).

Since upgrading to 1.254 (from 1.233?) the timer isn't working well. It still
detects the change and queues a build, but the quiet time timer never counts
down. We have configured a quiet-time of 30 minutes, and it never decreases.
Ultimately, the nightly build will clear it out of the queue.