Is Replikanto compatible with NinjaTrader 8.1.8?

This article answers whether Replikanto works on NinjaTrader 8.1.8 and whether you need to reinstall it after updating. Update: starting with Replikanto 1.7.0.0, one Replikanto build runs on every NinjaTrader 8.1.6 or later, including 8.1.8, so a NinjaTrader update no longer requires a matching Replikanto build or a reinstall.

NinjaTrader has released NinjaTrader 8.1.8, a minor update to the platform. You can read the official release notes here: NinjaTrader 8.1.8 Release Notes.

Replikanto is compatible with NinjaTrader 8.1.8. Replikanto 1.7.0.0 and later work on NinjaTrader 8.1.8 as on every other NinjaTrader version from 8.1.6 on. If you are still running Replikanto 1.6.1.7 (built for NinjaTrader 8.1.7+), it also works on NinjaTrader 8.1.8 with no reinstall and no reconfiguration required. We have tested and confirmed this.

Updating NinjaTrader to 8.1.8 therefore does not affect Replikanto — it keeps running automatically after you update. If you are on Replikanto 1.6.1.7 or earlier, we recommend updating to Replikanto 1.7.0.0 or later, so that future NinjaTrader updates never require a different Replikanto build.

Slower closing on multiple Sim/Paper Trading accounts on 8.1.7 and 8.1.8

Closing positions on several simulation (Sim) or Paper Trading accounts at once, using either Flatten All or Close, can take noticeably longer to actually fill on NinjaTrader 8.1.7 and 8.1.8. Live and non-Paper-Trading demo broker accounts are not affected, and the delay is not caused by Replikanto.

On these versions the delay appears when Tools > Options > Trading > Enforce partial fills is checked. Uncheck it to speed up execution.

NinjaTrader 8.1.8.4: required update and slower screen updates

NinjaTrader 8.1.8.4 is a required update. Older 8.1.8 builds show a "Required update" prompt at startup and must update before you can continue, and NinjaTrader asks prop firm account users to stay on the latest version. Replikanto 1.7.0.0 and later run on 8.1.8.4 with no reinstall.

Since 8.1.8.4, some traders see orders stay orange for about a second after moving them in Chart Trader, and the Positions tab, the account P&L and the chart position marker lag 3 to 5 seconds after fills while the Executions and Orders tabs update right away. It also happens with every Replikanto follower turned off and on Sim101, so it is not caused by Replikanto. In logs we reviewed, the broker confirmed each order change in about 45 ms, so the delay was in the display, not in the order. If you see it, report it to NinjaTrader support with a screen recording and a zip of your log and trace folders from Documents\NinjaTrader 8.

NinjaTrader 8.1.8.5: fix for NinjaTrader not opening

NinjaTrader 8.1.8.5, released on November 3, 2026, fixes a problem with COT (Commitments of Traders) data that prevented some users from launching NinjaTrader Desktop. It was caused by a change in the format of the COT report, which the CFTC has since corrected on its side, and not by Replikanto. If NinjaTrader won't open, update it to 8.1.8.5: the installer you download from your NinjaTrader account runs without opening NinjaTrader. Replikanto 1.7.0.0 and later, like every other FlowBots product, run on 8.1.8.5 with no reinstall.

The 8.1.8.5 release notes list only this fix and don't mention the slower screen updates described above.

What's new in NinjaTrader 8.1.8

Highlights from NinjaTrader's release include:

• Single Stock Futures trading (a new asset class)
• A dedicated Single Stock Futures workspace
• An enhanced earnings calendar with EPS and revenue data
• Real-time stock market data for live accounts
• Stock hot lists (most active, top gainers/losers, gap up/down movers)
• Manual lockout controls for prop-trading accounts

For details on when a Replikanto reinstall is or is not required after a NinjaTrader update, see Do I need to reinstall Replikanto when updating NinjaTrader?