Issue with serverscript not running?

Before reading, things you should know: - The info i've collected here is from Studio's multiplayer testing server feature only. I'm not sure if this happens if I play it directly from the roblox webstie -- if playing it from there would help solve this issue, let me know. - This hasn't happened with any of my other games.

So, in my game, I have a Script in it, plain and simple. It's got some stuff in it obviously, but the only thing that matters is a Print function at the very beginning.

If I test the game straight from Studio, it works as intended, printing the string.

Now let's head over to Studio's server testing. I set it to 1 player and started it up. From the server's point of view, the string prints, but from the client's, it doesn't.

There is absolutely NO situation i've made where the print in the beginning of the script is not supposed to happen, so this must mean that the script isn't running at all. I'm extremely confused here, i've asked other people and didn't understand what they said. This hasn't happened in any of my other games like i've said before, so I have no idea what to do.

-----------------------------------------------------------------EDIT---------------------------------------------------------------

So apparently what's inside the rest of the script does actually matter.

After the prints, the ServerScript holds a few events triggered by RemoteEvents, primarily ones that change properties of Workspace objects.

The case here being that, in Studio Test, I can trigger these RemoteEvents via UserInputService fine, but on Server Test I can't, because the script doesn't run at all.

Once again, I've made FilteringEnabled games before and tested them on server, I've done all the things said here without issue... I just don't know what's causing this and why it hasn't happened in my previous games

-----------------------------------------------------------------EDIT---------------------------------------------------------------

By request, the server script.

-- SETUP: Set up the game when the server starts

print('it works')

jar = require(workspace.jar)
jar.WeldField(workspace)
jar.WeldField(game.ReplicatedStorage.Assets)
comm = game.ReplicatedStorage.Comm
db = game.ReplicatedStorage.Database

game.Players.PlayerAdded:connect(function(player)
    player.CharacterAdded:connect(function(char)
        wait(.5)
        char:MoveTo(workspace.Spawnbox.Base.Position)
    end)
end)

-- IN-GAME STUFF HANDLED BY SERVER: For the few in-game events that are handled on the server instead of the clients

-- Player objects such as object folder. Wouldn't want em to be tampered with eh?

function comm.GSA.OnServerInvoke(player, event)
            if event == 'CreateObjects' then

            obj = Instance.new('Folder', player)
        obj.Name = 'Objects'
            cha = Instance.new('StringValue', obj)
        cha.Name = 'vCharacter'
        cha.Value = 'Ace'

        for i, v in pairs(game.ReplicatedStorage.Database.Characters[cha.Value]:GetChildren()) do
            local stat = v:Clone()
            v.Parent = obj
        end

        -- Find player's character for future reference
        for i, v in pairs(workspace:GetChildren()) do
            if v:IsA'Model' then
                if v:FindFirstChild'Controller' then
                    if v.Controller.Value == player.Name then
                        playerchar = v
                    end
                end
            end
        end
        return obj
    end
end

-- Player character spawning, movement, and positioning

-- Movement

MR = 0
workspace.PlayerMovement.OnServerEvent:connect(function(player, direction)
    print'accepted'
    MR = player.Objects.MoveRate.Value
    local RPV = playerchar.PlayerRootPart.Movement
    if direction == 'Up' then
        print'recieved'
        RPV.Velocity = RPV.Velocity + Vector3.new(MR,0,0)
    elseif direction == 'Down' then
        RPV.Velocity = RPV.Velocity + Vector3.new(-MR,0,0)
    elseif direction == 'Left' then
        RPV.Velocity = RPV.Velocity + Vector3.new(0,0,-MR)
    elseif direction == 'Right' then
        RPV.Velocity = RPV.Velocity + Vector3.new(0,0,MR)
    elseif direction == 'stopUp' then
        RPV.Velocity = RPV.Velocity - Vector3.new(MR,0,0)
    elseif direction == 'stopDown' then
        RPV.Velocity = RPV.Velocity - Vector3.new(-MR,0,0)
    elseif direction == 'stopLeft' then
        RPV.Velocity = RPV.Velocity - Vector3.new(0,0,-MR)
    elseif direction == 'stopRight' then
        RPV.Velocity = RPV.Velocity - Vector3.new(0,0,MR)
    end
end)