I clicked on some infantry and then clicked on a square to move them onto that square. Nothing happened. Me being very impatient at the time spammed the button for a few seconds. It then came up with a dialogue box telling me i was out of energy. I'd some how managed to burn roughly 25 energy with out actually doing anything. The counter in the top left hadn't been going down and their was no indication that the game was anything but temporarily frozen like it often is. Has anyone else come across this? On a separate note I think it would be a good idea to add a second dialogue box when converting "Energy Supplies" to "Rechargeable Power". I think you should do this because it isn't immediately made clear how valuable this resource is. I managed to spend all my "Energy Reserves" immediately because I wasn't paying attention when i closed the dialogue box.