Yet Another Zombie Survivors 1.0.1a Hotfix Guide

Update to 1.0.1a or later if Mechanic's Antithesis completes but does not stay complete. The September 18 hotfix also documents PC backup import through an empty Change Save Slot entry with keyboard T or controller Y. Use the restore guide if several progress systems are missing.

Which action fits your problem?

• Antithesis reverts: update, reopen the Mission Log, then retry its two conditions only if it is still incomplete. Keep before-and-after screenshots if the status reverts again.
• Missing PC progress: check the active slot first, then import a backup into an empty slot and compare profiles.
• Projectiles fire backwards at close range: this hotfix lists a related correction; broader Survivor aiming fixes follow in 1.0.1b.
• Medic–Ranger synergy colors look wrong: 1.0.1a fixes the node colors. Do not mistake a presentation correction for a new bonus.

These actions connect the official notice to the mission checklist, so you can address the specific failure without resetting unrelated progress.

Review before your next run

Check the installed version and mission state first. If a backup is involved, keep the original slot while checking the recovered profile. This patch record preserves the September 18 release date; the source review date is October 9, 2026. The stable build tracked by this wiki is now 1.0.1b.