Chrome Warning: Chrome's new "Memory Saver" feature seems to be occasionally causing bugs to occur. This feature takes data and stores it on the HD instead of keeping it in memory when a tab goes inactive or browser loses focus. Because AW has a lot of data, this can cause problems if the data hasn't finished being reloaded before actions are taken. You can disable this feature in Settings -> Performance -> Memory Saver, try excepting AW from this feature, or you can wait a few seconds before doing anything when you return to your AW game. Avoid leaving the tab when things such as sleep are processing/running.