Some players have reported that they are unable to open their Attack Log. The game team is aware of this issue and is working to resolve it. It's not always their top priority, since it doesn't directly affect gameplay or game stability, but they understand it's important to players and will have the situation corrected as soon as possible.
For now, some players have found that if they hit 5-10 smaller bases, it forces the attack log to start working again. Give this a try and it just might solve your problem!