Program: 80762
Project: 80762
Buggy source:
@SubscribeEvent(priority=EventPriority.HIGHEST) public void renderWorldLast(RenderWorldLastEvent e){
  EntityPlayer player=Minecraft.getMinecraft().thePlayer;
  boolean holdingWrench=false;
  if (player.inventory.getCurrentItem() == null)   return;
  if (ProgressiveAutomation.proxy.isServer())   return;
  if (player.inventory.getCurrentItem().getItem().equals(PAItems.wrench))   holdingWrench=true;
  float playerOffsetX=-(float)(player.lastTickPosX + (player.posX - player.lastTickPosX) * e.partialTicks);
  float playerOffsetY=-(float)(player.lastTickPosY + (player.posY - player.lastTickPosY) * e.partialTicks);
  float playerOffsetZ=-(float)(player.lastTickPosZ + (player.posZ - player.lastTickPosZ) * e.partialTicks);
  GL11.glColorMask(true,true,true,true);
  GL11.glEnable(GL11.GL_ALPHA_TEST);
  GL11.glDisable(GL11.GL_FOG);
  GL11.glEnable(GL11.GL_CULL_FACE);
  GL11.glEnable(GL11.GL_BLEND);
  GL11.glBlendFunc(GL11.GL_SRC_ALPHA,GL11.GL_ONE_MINUS_SRC_ALPHA);
  GL11.glDisable(GL11.GL_TEXTURE_2D);
  GL11.glShadeModel(GL11.GL_FLAT);
  for (  UpgradeableTileEntity machine : machines) {
    if (((TileEntity)machine).isInvalid())     continue;
    if (!machine.getWorldObj().isRemote)     continue;
    if (!holdingWrench && !machine.displayRange())     continue;
    float r=randomColour(machine.xCoord);
    float g=randomColour(machine.yCoord);
    float b=randomColour(machine.zCoord);
    GL11.glPushMatrix();
    GL11.glColor4f(r,g,b,0.4F);
    GL11.glTranslatef(playerOffsetX,playerOffsetY,playerOffsetZ);
    Point3I block=machine.getRangeBlock();
    renderBlock(block.getX(),block.getY(),block.getZ());
    GL11.glPopMatrix();
  }
  GL11.glEnable(GL11.GL_TEXTURE_2D);
}

Fixed version (ground truth):
@SubscribeEvent(priority=EventPriority.HIGHEST) public void renderWorldLast(RenderWorldLastEvent e){
  if (ProgressiveAutomation.proxy.isServer())   return;
  EntityPlayer player=Minecraft.getMinecraft().thePlayer;
  boolean holdingWrench=false;
  if (player.inventory.getCurrentItem() == null)   return;
  if (player.inventory.getCurrentItem().getItem().equals(PAItems.wrench))   holdingWrench=true;
  float playerOffsetX=-(float)(player.lastTickPosX + (player.posX - player.lastTickPosX) * e.partialTicks);
  float playerOffsetY=-(float)(player.lastTickPosY + (player.posY - player.lastTickPosY) * e.partialTicks);
  float playerOffsetZ=-(float)(player.lastTickPosZ + (player.posZ - player.lastTickPosZ) * e.partialTicks);
  GL11.glColorMask(true,true,true,true);
  GL11.glEnable(GL11.GL_ALPHA_TEST);
  GL11.glDisable(GL11.GL_FOG);
  GL11.glEnable(GL11.GL_CULL_FACE);
  GL11.glEnable(GL11.GL_BLEND);
  GL11.glBlendFunc(GL11.GL_SRC_ALPHA,GL11.GL_ONE_MINUS_SRC_ALPHA);
  GL11.glDisable(GL11.GL_TEXTURE_2D);
  GL11.glShadeModel(GL11.GL_FLAT);
  for (  UpgradeableTileEntity machine : machines) {
    if (((TileEntity)machine).isInvalid())     continue;
    if (!machine.getWorldObj().isRemote)     continue;
    if (!holdingWrench && !machine.displayRange())     continue;
    float r=randomColour(machine.xCoord);
    float g=randomColour(machine.yCoord);
    float b=randomColour(machine.zCoord);
    GL11.glPushMatrix();
    GL11.glColor4f(r,g,b,0.4F);
    GL11.glTranslatef(playerOffsetX,playerOffsetY,playerOffsetZ);
    Point3I block=machine.getRangeBlock();
    renderBlock(block.getX(),block.getY(),block.getZ());
    GL11.glPopMatrix();
  }
  GL11.glEnable(GL11.GL_TEXTURE_2D);
}