The rendering of the ice.window hidden text field had changed, with an "autocomplete" attribute now being rendered in a way that broke the regex in the javatest client. That's been fixed. Also, the ReceiveUpdatesActor was not properly accumulating and reporting statistics in the case where push updates were being accumulated with a poll delay (as opposed to a blocking connection). This has been improved.
There is a new cookie in the initial response that the JMeter script needed to have a regex for. This was an issue with one script, the other not involved in push, and the javatestclient uses automatic cookie support. This has been added.