I assume it is this issue you are talking about? I don't know, we have fixed issues with pbFillHeight on the dynamic object container. That of course does not guarantee that it works as you expect it, in your specific scenario..

Can you post a runnable example that demo's the issue?

Also, are you setting pbFillHeight also on the dynamic object container itself or only on the cWebList inside it? If not try setting it to true on the cWebDynamicObject container as well..