Quick answer: Connect the button's pressed signal to a handler, make sure the button is not disabled, and check that no Control above it is eating the input with its mouse filter.
A Godot button that does nothing on click is usually unconnected, disabled, or blocked by an overlay. Each is quick to check. Here is the order.
How to fix it
1. Connect the pressed signal
The button emits pressed when clicked; connect it to a function in the editor or with code. An unconnected button looks fine but calls nothing.
2. Check it is enabled
A disabled button ignores input. Confirm the disabled property is off and the button is visible and inside the screen, not just present in the tree.
3. Look for an overlay eating input
A transparent Control or panel on top with its mouse filter set to Stop will consume clicks before the button. Set overlays to Ignore, or fix the layering, so the button receives the input.
Catching the ones you can't reproduce
The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.
Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.
This is where a tool like Bugnet earns its place. Its SDK captures every Godot error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.
The bug you can't reproduce isn't gone — it's just invisible until you capture it from the player's device.