Product Version: NetBeans IDE Dev (Build 071113)
Java: 1.6.0; Java HotSpot(TM) Client VM 1.6.0-b105
System: Windows XP version 5.1 running on x86; Cp1251; ru_RU (nb)
Userdir: C:\Documents and Settings\Manowar\.netbeans\dev

Steps to reproduce:
1. Create java project
2. Create Main class:

===============
1 package javaapplication4;
2
3 import java.awt.Color;
4
5 public class Main {
6
7    public static void main(String[] args) {
8        final int height = 256;
9        final int width = 256;
10
11        for (int x = 0; x < width; x++) {
12            float hue = (float) x / (float) width;
13            for (int y = 0; y < height; y++) {
14                float saturation = 1f;
15                float brightness = 1f;
16                if (y < height / 2) {
17                    saturation = (float) y * (float) 2 / (float) height;
18                } else {
19                    brightness = 1f - (float) (y - height / 2) / (float) height;
20                }
21                Color color = new Color(Color.HSBtoRGB(hue, saturation, brightness));
22            }
23        }
24    }
25
26 }
===============

3. Put breakpoint with condition x == 255 at line #12.
4. Run. Breakpoint works.
5. Remove first breakpoint and put breakpoint with condition y == 255 at line #21.
6. Run. Breakpoint works.
7. Change condition of second breakpoint at line #21 to x == 255.
8. Run. Breakpoint doesn't work. Application stuck untill you remove breakpoint.