In multiplayer mode, homing projectiles on the client do not follow the homing path. Instead they appear to fly straight, as if the projectiles are not homing. Viewed on the server, the projectiles do follow the homing path. So it is just on the clients that the projectiles are not displayed properly.
For the homing target, add a cube to the scene, and then make it move via one of the mover scripts.
Use the rocket launcher weapon, and add the following script to the weapon make the projectiles home:
local function OnProjectileSpawned(weapon, projectile)
projectile.homingTarget = myHomingTarget -- this is the target from step 1 above
projectile.homingAcceleration = 10000
projectile.drag = 5
A similar issue occurs when I set the spreadModifier for a player shooting projectiles. The client does not see the spread path, and instead just sees the projectiles go straight.