Don't go over cube level 196 during offline time. The game will not load, nor import such a state. (Cube level 196 is the max during online play as far I can tell, the bar just stops)
The white flag seems not always to work. Not sure, but I have the feeling that after using abandon the white flags isn't active. I got raided once after abandon and also having seen player show up in my attack list without an army. Also I think after a battle you should get some time to rebuild your army. I got raided immediately after winning a battle, but of course lost it. My army had off course casualties from my own attack.
Yeah there was a "backdoor" to attack whiteflaged players, but it should be no longer possible. We can set the timeout of the red flag like 5 minutes from the end of the battle.
 "Chef Last Stand"){kind=icon}
 "Happy Cube Idle"){kind=icon}
 "The Final Earth"){kind=icon}
 "Tap Tap West"){kind=icon}
Yeah there was a "backdoor" to attack whiteflaged players, but it should be no longer possible. We can set the timeout of the red flag like 5 minutes from the end of the battle.