The attached TestOhlcObjects strategy creates an OHLC Informer widget on the active chart and removes it on stop.
How to reproduce the bug:
1) run local the TestOhlcObjects strategy;
2) exit the platform;
3) enter the platform;
What is expected: no OHLC Informer on the chart.
What actually is: the created OHLC Informer has not been removed by the strategy during exiting platform.

package jforex;

import com.dukascopy.api.*;
import com.dukascopy.api.drawings.*;

public class TestOhlcObjects implements IStrategy {
    private IChart chart;
    private IOhlcChartObject ohlc;
    
    public void onStart(IContext context) throws JFException {
        chart = context.getLastActiveChart();
        ohlc = chart.getChartObjectFactory().createOhlcInformer();
        chart.add(ohlc);
        ohlc.setFillOpacity(0.2f);
    }
    
    public void onStop() throws JFException {
        chart.remove(ohlc);
    }
    
    public void onAccount(IAccount account) throws JFException {}
    public void onMessage(IMessage message) throws JFException {}
    public void onTick(Instrument instrument, ITick tick) throws JFException {}
    public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {}
}

There is no such a bug with other types of chart objects.

We could not replicate this.

Yes, the bug is fixed in the newest API 2.9.5.2 version.

Dear Support team,

I beg your pardon for mistakenly confirmation and closing OHLC Informer bug topic.
That bug can be easily reproduced on DEMO ver. 2.30.2.

Do you exit and re-enter the platform while trying to replicate the bug?

Yes we did and we still can't replicate it. Is also the formatting of the object the same as it was plotted by the strategy after relaunching the platform?

Yes, it was. I can post screenshots on your request.

There must be something missing then in the case that you describe since we followed the steps and could not replicate this.

Exactly step to replicate the bug on DEMO 2.30.2:
1) open a new chart;
2) close default OHLC Index: the chart is clear now;
3) start the TestOhlcObjects strategy (local run): a custom OHLC Index appears in the top left corner of the chart;
See screenshot after step 3
4) do not stop TestOhlcObjects strategy, exit (Menu -> File-> Exit) and re-enter the platform: custom OHLC Index is not removed;
See screenshot after step 4, pay attention to the Messages Tab: it is just after re-entering to the platform.

This was the difference - we did stop the strategy. The reason why the object remains on the chart is because if you close the platform onStop does not get executed, rather all started strategies get terminated.