Version 6.0 has the following known issues which will be fixed in an upcoming update:
Street Assault Syndicate Reward Display Issue
The Syndicate reward popup will not display the reward item in version 6.0. It is only a display error and players will still receive the rewards they earn.
News Feed Display Issue
System related messages (e.g. reward notifications) will not be displayed in the News section.
PvP Battle Result Screen Display Error
If your Mafia attack stat is greater than 2,147,483,647, it will cause a display error and the stat will become negative on the Battle Result screen.
However, this is only a display error and will not affect the actual battle result.
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This will be updated as more information becomes available.
Thank you.