I just started the game a few days ago.
On my 3rd or 4th restart of the main simulation, the evolution tree is all black making it impossible to evolve anything and therefore to play the primary simulation.
If I leave for another simu and get back after a bit, I'm back on the main screen I can tap and get some resource but I have no choice but to go back to the broken tree.
This is completely blocking the game, which sucks even more since I have just purchased the infinity pack