Here are somethings basic issues I've noticed after a couple of games, these probably have been listed but here goes anyway:
Details of armour in shop don't stay shown when moused over once purchased.
Resurection countdown covers game notifications.
When dying last enemy attacked sometimes stays selected.
Loading splash screen sometimes doesn't clear to reveal game once loaded, Alt+Tab in and out of game clears it.
Rook can be difficult to target when standing infront of and amongest other models. I found targeting the legs helps
Can target things through players gui when selecting speacial skills etc (seems to be where the gui is transparent)