Markers/Overlays not visible after mouse wheel/DClick zoom

[bic...@gmail.com]

It seems when the issue happened on April 7 (bad Gmap release... which
incidentally my topic which had many replies seems to be deleted) that
our mapping software has started having many many glitches in it.

This error exists in all browsers.

I'm wonedering if anyone can shed light on this.

I'm trying to figure out why when I zoom with my mouse wheel, all
markers are hidden, and I get the error:

---------------------
a is null
http://maps.gstatic.com/intl/en_ALL/mapfiles/239b/maps2.api/main.js
Line 530

function (a, b) {
    var c = this.Rn[a.Ca ? a.Ca() : ""];
    re(this.Fl, a);
    if (c) {
        c.la(a, b);
        A(this, "removeoverlay", a);
    } else if (re(a instanceof yj ? this.Yc : this.Qa, a)) {
        a.remove();
        zj(a);
        A(this, "removeoverlay", a);
    }
}
--------------------------------------

My Initialize function is:
map = new GMap2(document.getElementById("map"));

                //we don't want to give the map object to it's constructor. 
Doing so
will automatically modify the map
                //when we run directions. instead, we just want to use the 
direction
object seperate of the map object.
                gdir = new GDirections(null, 
document.getElementById("directions"));
                geoStart = new GClientGeocoder();
                overlays = new SVOverlay();

                //map.setUIToDefault();

                map.addMapType(G_PHYSICAL_MAP);
                map.addControl(new GLargeMapControl3D());
                map.addControl(new GScaleControl());
                map.addControl(new GMapTypeControl());

                //mapTypeControl = new GMapTypeControl();
                //map.addControl(mapTypeControl);
                map.addControl(overlays);

                map.enableContinuousZoom();
                map.enableScrollWheelZoom();
                keyboardHandler = new GKeyboardHandler(map);
                //Set the Center
                //setStartingLatLng(startingAddress,startingLat,startingLng,
startingZoom)

                map.setCenter(new GLatLng(startingLat, startingLng), 
startingZoom);

                //When the map is zoomed, we need to update the tooltip 
positions so
they stay near the markers.
                GEvent.addListener(map,"zoomend", function() {
                        if(units)
                        {
                                drawToolTips(true);

                        }
                });

                GEvent.addListener(map, "moveend", function() {
                        if(units)
                        {
                                drawToolTips();
                        }
                });

                GEvent.addListener(gdir, "load", function()
                {
                        if(dPoly) map.removeOverlay(dPoly);
                        dPoly = gdir.getPolyline();
                        map.addOverlay(dPoly);
                });


                GEvent.addListener(gdir, "error", function()
                {
                        var code = gdir.getStatus().code;
                        var reason="Code "+code;
                        if (reasons[code])
                        {
                          reason = "Code "+code +" : "+reasons[code]
                        }
                        alert("Failed to obtain directions, "+reason);
                });


                // map type changed  Do we want to do anything?
                GEvent.addListener(map,"maptypechanged", function() {
                   });

                toggleState("error");
                toggleState("tracking");
                startGeneralUse();

        }
}

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