Ive had hours worth of progress lost for the last time with this crap because it dont auto save when you buy something. Not worth the time to play it at all as it stands.
This occurs when your system is running low on ram. Closing and reopening the browser is a quick fix for this. If you have another program running that is using most of your computer's resources, that can be responsible too. If all else fails, rebooting your computer should fix it.
This occurs when your system is running low on ram. Closing and reopening the browser is a quick fix for this. If you have another program running that is using most of your computer's resources, that can be responsible too. If all else fails, rebooting your computer should fix it.