Currently if you start up a practice game and then choose to repack your hero after the match starts it takes you back to the picking screen. If you then allow the time to run out completely without choosing a new hero your computer will re-enter the game however the menu will remain open. As a result it is impossible to re-enter the practice game and you have to disconnect and recreate it. The exit game button (red 'x' in the top right) also stops working in this state.