Box Light Stops Working After Move/Rotate

[Monkey Frog Studio]

I've run into an issue where the box light shows up in the 3D viewport, but doesn't in a test game. This often occurs after the box light has been placed and then, later, moved or rotated. So, if I create a box light and position initially, then run a test game, it shows up fine. But if I then move or rotate the box light, it fails to work in test game even though it continues to show correctly in the 3D viewport (see screen shot).

[Monkey Frog Studio]

This appears to be happening when you tick Cast Shadows to False. Works fine if Cast Shadows is active.