TweenPosition Not Working On This Computer?

So, the Tweening works on my other computer and the computers of others. However, it doesn’t work on this laptop (Pavilion dv5 running Windows 7)…?

Problem: The first tween works as expected. It appears that the second tween never happens and the GUI then disappears. No errors (it works properly on other computers)

Place: http://www.roblox.com/Farm-Testing-Plant-Saplings-place?id=152166169

Code:

[code]local Waiting = false

script.Parent.Notify.Event:connect(function( Length, Message, Color )
while( Waiting )do wait(1); end
Waiting = true
local newPrompt = script.Parent.ChangePrompt:clone()
newPrompt.Parent = script.Parent
newPrompt.TextColor3 = Color
newPrompt.Text = Message
newPrompt:TweenPosition(UDim2.new(0.5, -150, 1, -250), “Out”, “Quad”, (2Length)/3, true)
wait((2
Length)/3)
newPrompt:TweenPosition(UDim2.new(0.5, -150, 1, 0), “In”, “Quad”, Length/3, false)
wait(Length/3)
newPrompt:Destroy()
Waiting = false
end)[/code]