I've made prototype of my game and exported it.
Game is made of tiles that are connected - appropriate wall is shown depending on neighbour walls.
You can see it here: http://tecbug.pl/bt.
It should look like this (on IE):
<img src="http://tecbug.pl/pub/bt01ie.png" border="0">
But it looks like this on Chrome:
<img src="http://tecbug.pl/pub/bt01chrome.png" border="0">
And like this on Firefox:
<img src="http://tecbug.pl/pub/bt01firefox.png" border="0">
This issue doesn't occur on prewiews from C2 (all browsers).