Thank you for playing Undead Factory!
We have discovered that a bug occurred in-game that interfered with players' ability to successfully upgrade certain units and facilities.
Due to this bug players who started upgrades and then logged out of the game found that their upgrades would not begin correctly.This issue has already been addressed and is now fixed.
We will be delivering compensation to players who were affected by this bug. If you believe you were affected by this issue, please contact us with the details of what resources were lost, and the date that you encountered the bug. (Please tap on the "Click Here for Info" button below to contact us)
We sincerely apologize if this issue interfered with your game experience in any way.