I locked the last post so can't add to it. But I have one final observation. Under certain circumstances the onTick certainly doesn't illuminate (it's something to do with stopping and re-starting the strategy, but I can't remember exactly all the actions). But when the onTick doesn't illuminate I can confirm that there is no actual tick signal because that part of the strategy doesn't run.

And I couldn't reactivate the tick signal until I had completely rebooted my PC (so simply logging out of VJ and closing the strategy wasn't enough). Why this problem happens in the first place, I've no idea. And why it needs a complete PC reboot to fix, I have no idea also.

So that seems to be a/the solution.

There is one other thing I observed. Even with the reboot, it can be the case that the onCandle bar (which I also use in addition to the onTick) doesn't illuminate. However, the signal was still being received in onCandle (I checked that) although there was no illumination.

So two points - you may need a PC reboot to restore signals, and no illumination doesn't mean no signal.