Flashing Icons over multiple buildings
What are the flashing icons over my buildings for?
I have nothing currently upgrading. No training in progress. All skill points for my hero have been assigned, and hero upgraded. And all buildings are maxed. Yet, academy, barracks and heros house all have flashing icons above them. Why?
I play Vikings as well. And there they have little arrows above the hero abode and next to hero to indicate unused skill points. But I have never seen this for any other buildings.
Please explain. Thank you.