invisible units...? (help me!)

[mipe]

Somewhy, in middle of me playing, all my units turn invisible so that I can't see them. Also my citys dont have anymore that bar which shows how long it takes until growth/production is finished...

 

[mipe]

it gets worse... I tried normal BtS and it has the same problem too...! I sometimes may accidentally click wrong buttons, does any of keyboard shortcuts or inside game buttons do something like this?

 

[BeefontheBone]

There should be one of the tiny buttons above the minimap to toggle those displays - otherwise Alt-I is the interface and I can't remember the terrain only shortcut. Alt-T ?