Seems fine here. This example changes the label text on a 'timer' event:
Global title$="Label change example"
AppTitle title$
win = CreateWindow(title$,200,100,200,50,Desktop(),1)
lab=CreateLabel(":-)",15,5,200,28,win)
timer=CreateTimer(2)
Dim l$(3)
l$(1)="Hello" : l$(2)="Blitz" : l$(3)="User"
; --------------------------
Repeat
event=WaitEvent()
DebugLog "EVENT $"+Hex$(event)
Select event
Case $803 : Exit
Case $103 : If EventData()=27 Exit
Case $4001
num=num+1 : If num=4 num=1
SetGadgetText lab,l$(num)
End Select
Forever
End
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