I've noticed a couple of issues.
First, when trying to play on my laptop in Chrome, everything seems to work except that I'm unable to scroll up to the top of the screen. This applies to areas like the Lobby, where I can scroll down and see the chat window, but the content at the very top of the screen is chopped off, and I can only see the lower parts of the letters. In-game, this means I can't see how much gold, mana, etc., I have.
I don't have a problem in Chrome when playing on one of my desktops, and I don't have a problem playing on the laptop in IE.
A more game-related concern: I can't seem to select all troops of a type by double clicking on one of those troops, as suggested in the game instructions. I have this problem regardless of browser or computer. I can select groups of troops by dragging and dropping, and select individual troops by clicking on them - I just can't select, e.g., all archidons.
This makes controlling troops much more difficult than I think it's meant to be - so I have a hard time, for example, preventing melee troops from crossing walls to run into battle, when I have ranged troops attacking from behind those walls and the walls have not been breached.
I'm also seeing a fair amount of losses due to lagging out - more from opponents than from my end, although I've experienced it as well.
Otherwise, it's been brilliant so far - great game - looking forward to playing more.