eXT sync broken in 0.5.1

[user]

energyXT 1.4.1 (a VST-based studio which is a good expander for buze/buzz) will synchronise tempo as well as start and stop with buze 0.5.0 (and earlier versions); since buze 0.5.1 eXT still picks up the tempo info but it does not stop and start when you stop and start buze playing the way it used to.

Maybe something to do with how buze sends stop/start information? I don't know. But it's a pain.