Problems with lightbox and captions
Possible Answers to Your Question:
Layers is not designed with any specific support for Simple Lightbox, but I can confirm the two work together without issue. Please see the demo for our lightbox tutorial which demonstrates this here:
You must have “enable in widgets” checked in the Simple Lightbox settings.
Captions were never even supported in galleries before Layers 1.5.4 when we added styling to allow them to be visible. If your captions were previously appearing on hover, it was due to a plugin you were using such as Jetpack.