Batch disappeared

Anybody else seen this?
I have a large batch set-up with many compasses, (one for each shot).
I have just added another and now my batch is showing as empty.
On the desk I can still see all the relevant clips and my context views are still working, but batch itself is showing as blank.

Have you turned on the navigator to check the Batch Schematic. Use CONTROL+ALT+N. This will give you a scrollable view of the schematic.

Grant

Yes, I usually have that on anyway, nothing there, but my contexts are showing, plus all the clips are there in the reels.
Oddly, I managed to get it back by loading the setup rather than the batch, maybe I’ve hit some kind of memory limit.