My fireplace has lost its flame. Its a linden house, the house control shows on

[Spice Hancroft]

The fireplace is not working. The house control shows on and the local lights is checked in Preferences. Is there something else I can do or is this a system issue?

[Rolig Loon]

The flame is a particle effect.  Check to be sure that you have particles turned on in your viewer.  You might have switched them off by accident.  Type CTRL + Shift + Alt + = to turn them ON or OFF.  If that doesn't cure the problem for you, the other thing to check is the Max. Particle Count slider in Preferences >>. Graphics.  That should be set at 4096 normally.  If it was shoved to a smaller value, you wouldn't see many particles at all.