Is this GUI? GUI ignores the z position, instead ordering based on layers and order in the project outline (the lowest elements are drawn last - end up on top).
Hmm… If the labels are children of an object which itself has z position over 0.2, they’d end up with z over 1, which means they wouldn’t be rendered. Could that be the problem?
Yes, that is exactly what had happened. At some point I appear to have accidentally changed the z position for the containing game object to 0.5. And then suddenly, I could not see the labels any more
Nice one - I had never really bothered to figure out just what that {near = -1,far = 1} parameter was meant for. Having control over those two values is really useful.