Can someone help me understand why my buttons don't align with monitor_touch events in CraftOS 1.5

So I'm having trouble with the UI of my cc program. Basically my monitor touch events all take place about half a cell higher than they should and off to the right. Its not completely consistent as some events take place almost full cells higher but the red boxes in this image show where I actually have to press to use the buttons.
http://i.imgur.com/B21FSs9.png

At first I thought it may be a textScale issue but setting it to 1 doesn't fix the alignment issues. I see no reason why my code shouldn't work even if it is a bit messy. I have stripped out everything unrelated to the buttons.

Full code:
http://pastebin.com/1GYzD5iN

Button table:

local b = {  --table for roulette game buttons {text, x, y, active, bg colour, fg colour, inactive bg colour, inactive fg colour}
   {text = "ODD", x = 3, y = 10, active = false, bg = 32768, fg = 1, inactivebg = 256, inactivefg = 1},
   {text = " 0 ", x = 7, y = 10, active = false, bg = 8192, fg = 1, inactivebg = 256, inactivefg = 1},
   {text = "EVN", x = 11, y = 10, active = false, bg = 16384, fg = 1, inactivebg = 256, inactivefg = 1},
   {text = "SPIN!", x = 6, y = 12, active = false, bg = 32, fg = 1, inactivebg = 256, inactivefg = 1},
   {text = "0", x = 8, y = 18, active = true, bg = 128, fg = 1},
   {text = " +", x = 9, y = 18, active = true, bg = 8192, fg = 1},
   {text = " >", x = 11, y = 18, active = true, bg = 32, fg = 1},
   {text = ' '..string.char(194,59), x = 13, y = 18, active = true, bg = 8192, fg = 1},
   {text = "- ", x = 6, y = 18, active = true, bg = 16384, fg = 1},
   {text = "< ", x = 4, y = 18, active = true, bg = 64, fg = 1},
   {text = string.char(194,43)..' ', x = 2, y = 18, active = true, bg = 16384, fg = 1}
   --,{text = "Quit", x = 8, y = 12, active = true, bg = 16384, fg = 1}
}

Button control code:

local function buttonControl(x, y)
for i=1, #b do
  if y == b[i].y and x >= b[i].x and x < b[i].x + #b[i].text then
   if i == 1 then btnBetType(1); return
   elseif i == 2 then btnBetType(2); return
   elseif i == 3 then btnBetType(3); return
   elseif i == 4 and b[4].active and currentGame.bet > 0 then btnBetType(0); return
   elseif i == 5 then btnBet(0); return
   elseif i == 6 then btnBet(currentGame.base); return
   elseif i == 7 then btnBet(currentGame.base * 16); return
   elseif i == 8 then btnBet(currentGame.base * 64); return
   elseif i == 9 then btnBet(0-currentGame.base); return
   elseif i == 10 then btnBet(0-currentGame.base * 16); return
   elseif i == 11 then btnBet(0-currentGame.base * 64); return
   elseif i == 12 then return true
   end
  end
end
end

Certainly sounds like a scaling issue to me. Is this SSP or SMP we're talking about? If the latter, try it with the former.

https://github.com/dan200/ComputerCraft/issues/88

Works fine in single player so it seems to be that.

Its odd since someone else is working on a similar project on the server using 0.5 scale and everything is aligned perfectly.

I guess its just one of those things that can't really be solved. Thanks anyway.