Channel control can break with big red X.

[mstratford]

See https://oliversturm.com/2005/03/23/red-x/

This seems to be local to a specific instance of BAPSPresenter (ie doesn't do same on guest PC if occurs on presenter PC). Closing and opening presenter fixes issue.

Main issue baring this from progressing I expect is #14, I didn't get any logs from it at all.