EDIT: We've released a fix that will restore rewards to all of the blank mails. If you accidentally deleted the mail while it was blank, please contact customer support and they'll send you the rewards.
We are aware of the issue that has caused Jibber reward mails to become blank and are actively testing a fix. If the fix works, the result will simply be that the mail will be restored. If our tests do not work, we will re-send rewards to players in the mail.
Regardless, there is no need to contact customer support for this issue. I will update this thread as our solution is finalized.
Joel | Community Manager | Boss Fight Entertainment