I've tried various methods to obtain weekly Fibionacci pivots (from onBar in my strategy).
The numbers returned don't match what I see in the user interface with the same settings.

So, this returns monthly pivots just fine (the numbers match completely):
double[] pivots = indicators.fibPivot(instrument, Period.DAILY, OfferSide.BID, 9, 1);

However, this does not return the correct weekly pivots:
double[] pivots = indicators.fibPivot(instrument, Period.DAILY, OfferSide.BID, 8, 1);

I've tried everything I can think of, including calling the overloaded indicators.fibPivot that returns double[][], in addition to indicators.calculateIndicator. I simply can't get the output to match correctly.

I even cloned the Fibionacci indicator and added some logging messages - oddly, the bar that it calculates the correct weekly pivot from seems to contain less volume than a single day should (the bar shows a volume of 274,420 for EURUSD w/ this weeks data, whereas actual daily values typically are > 500k). I don't even know if this is relevant to the problem.

I've also tried manually calculating the pivots, without using any indicators, but again, the numbers don't match. I've tried Monday - end of Friday, Sunday-Sunday, Sunday 2:00 - Friday 2:00, etc.. Nothing seems to return the same numbers as this damn indicator.

Any ideas?

We were not able to reproduce the behavior you described. Could you please check if this strategy returns the correct levels:

package jforex.strategies.indicators;

import java.text.DecimalFormat;

import com.dukascopy.api.*;

/**
 * The startegy prints out daily, weekly and monthly pivot levels
 *
 */
public class Pivot2 implements IStrategy {
   private IConsole console;
   private IIndicators indicators;

   private Instrument instrument = Instrument.EURUSD;
   
   private static String[] pivotLevelNames = { "P", "R1", "S1", "R2", "S2", "R3", "S3" };

   public void onStart(IContext context) throws JFException {
      this.console = context.getConsole();
      this.indicators = context.getIndicators();
      
      boolean showHistoricalLevels = true;
      double [] pivotDaily = indicators.pivot(instrument, Period.DAILY, OfferSide.BID, 7, showHistoricalLevels, 0);
      double [] pivotWeekly = indicators.pivot(instrument, Period.WEEKLY, OfferSide.BID, 8, showHistoricalLevels, 0);
      double [] pivotMonthly = indicators.pivot(instrument, Period.MONTHLY, OfferSide.BID, 9, showHistoricalLevels, 0);

      print("pivotMonthly " +arrayToString(pivotMonthly));
      print("pivotWeekly " +arrayToString(pivotWeekly));
      print("pivotDaily " +arrayToString(pivotDaily));      
      
   }

   private void print(Object message) {
      console.getOut().println(message);
   }
   
   public static String arrayToString(double [] arr){
      String str = "";
      for (int r=0; r<arr.length; r++) {
          str += " " + pivotLevelNames[r] + ": "+ (new DecimalFormat("0.000000")).format(arr[r]) + "; ";
      }
      return str;
   }
   
   public void onAccount(IAccount account) throws JFException {}
   public void onMessage(IMessage message) throws JFException {}
   public void onStop() throws JFException {}
   public void onTick(Instrument instrument, ITick tick) throws JFException {}

   public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {}
   


}