Tap event working in simulator but not on actual phone

Solar2D Daily Builds and Public Releases
#1 
  
local left = display.newImage ("leftx.png")  
left.x = 30  
left.y = 450  
localGroup:insert(left)  
local right = display.newImage ("rightx.png")  
right.x = 290   
right.y = 450  
localGroup:insert(right)  
  
-- Puts in all four movement arrow images and positions them  
  
----------------------------------------------------------------------  
-- MOVE BALLOON --  
----------------------------------------------------------------------  
  
  
  
 function left:tap(event)  
 balloon.isFixedRotation = true  
 balloon.linearDamping = 1  
 balloon.angularVelocity = 0.1  
 balloon:setLinearVelocity( 0.1, 0.1 )  
 balloon:applyLinearImpulse( -0.2, -0.2, event.x, event.y )  
end  
left:addEventListener("tap",left)  
  
function right:tap(event)  
balloon.isFixedRotation = true  
balloon.linearDamping = 1  
 balloon.angularVelocity = 0.1  
 balloon:setLinearVelocity( 0.1, 0.1 )  
 balloon:applyLinearImpulse( 0.2, -0.2, event.x, event.y )  
end  
right:addEventListener("tap",right)

this code works perfectly on the simulator (windows) but nothing happens when trying to tap on device (T-mobile G1, Froyo 2.2) [import]uid: 24981 topic_id: 6854 reply_id: 306854[/import]