Risk locks and the daily reset
When a daily limit fires with Flatten & lock — or when you flip the Manual lockout switch yourself — the account gets locked. This page is the exact contract of what a lock does, what it does not do, and when it resets.
A lock is a skip
A locked account stops copying and keeps what it holds. The engine skips it on every fill and every reconciliation pass. A manual lock closes nothing and cancels nothing — it only stops new copies. (A Flatten & lock from a limit is the exception: that path also closes the account's positions and cancels its resting orders, because the whole point was to end the day.)
The account's row on Risk Management shows an amber LOCKED badge. Hover it and the tooltip names the reason: "Locked by hand", "Daily loss limit hit", or "Profit target hit".
Unlock the account and the next reconciliation pass re-aligns it with its leader — you do not need to re-enter anything. One deliberate safeguard: saving the limits form can never unlock an account. Only the explicit lockout switch on that account's row can. A whole-form save you meant as "update my numbers" cannot quietly put a locked account back in the market.
Locking a leader
Locking a leader stops its whole group: while the leader is locked, nothing copies to any of its followers. Open positions stay open everywhere. The app asks you to confirm before locking a leader, precisely because a stray click here silences an entire group.
A leader that hits its own daily limit goes further: that is a per-group kill switch. The group flattens and stops copying until you press Resume on the engine strip. Other groups keep running untouched.
Once per day, reset at 17:00 Chicago
A limit fires at most once per CME trading day. The trading day runs 17:00 to 17:00 Chicago time — the same boundary your broker uses to reset day P&L.
At the 17:00 CT session roll, the previous session's P&L number is discarded rather than carried forward. That closes an ugly edge case: during the maintenance break, a broker can keep reporting yesterday's P&L for a while, and a limit that trusted it would re-fire on a stale number. MirrorFill throws the stale figure away and waits for the new session's data before evaluating anything.
Locks themselves do not auto-expire — an account locked by a limit stays locked until you unlock it. What resets daily is the limit's ability to fire again.
Quick answers
Does a lock close my open position?
A manual lock, no — the account keeps its position and just stops copying. A limit set to Flatten & lock, yes — it closes positions and cancels resting orders as part of firing.
When can a limit fire again?
Next CME trading day. The day rolls at 17:00 Chicago time, and each limit fires at most once per day.
How do I get a locked account copying again?
Flip its Manual lockout switch off on Risk Management. The next reconciliation pass brings it back in line with the leader. If the whole group stopped because the leader breached, press Resume on the engine strip.