Google Play Store's hotfix update went up last night but Apple has not released theirs yet. The delay for the fix to be available for IOS is on the Apple side - not a delay on Gree's side. Apple has a series of processes that have to be done from their side so it takes a longer for the build to go out despite Gree submitting things to both Apple and Google at the same time.
They expect Apple's update to be released within the next several hours. Gree can't do anything to speed up this process as it's strictly in Apple's hands. Gree plans to send out compensation for the problem once Apple's update is available. I'll provide an update when we know more on that.
If you are on Android and are still experiencing issues try clearing your cache and restarting your device. Also, be sure you have gone to the Play Store and downloaded the most recent update if it is not being auto pushed (forced) to happen.