[OpenLayers-Users] problem with empty baselayer and google

[Steve.Toutant at inspq.qc.ca]

Hi,
I have a problem using an empty base layer with a google layer. They are 
defined like this
var googleH = new OpenLayers.Layer.Google( "Google Hybrid", { type: 
G_HYBRID_MAP, 'sphericalMercator': true} );
var aucunContexte = new OpenLayers.Layer("AucunContexte",{isBaseLayer: 
true});

I have an overlay layer
var overlay = new OpenLayers.Layer.WMS('RSS', 
'http://geo.inspq.rtss.qc.ca/cgi-bin/mapserv.exe?map=MAPCA&',{layers: 
'RSS', transparent: "true", format:"image/gif"},{isBaseLayer: false, 
visibility: true,singleTile:true});

When the empty layer and the overlay layer are visible by default when the 
application opens, everyting is fine. But if I switch to the google hybrid 
layer, I see only one tile at the upper left corner
But, if the applications loads with the hybrid and overlay layer visible, 
this problem does not occur. i can switch to the empty layer without 
problem.

I also tried with this, but the result is the same.
var aucunContexte = new OpenLayers.Layer("AucunContexte",{isBaseLayer: 
true, maxResolution: 156543.0339, maxExtent: new 
OpenLayers.Bounds(-20037508.34, -20037508.34, 20037508.34, 20037508.34)});

Here is the mapOptions
  var mapOptions = {
 projection: "EPSG:900913",
displayProjection: new OpenLayers.Projection("EPSG:4326"), //Pour afficher 
les coord lat long
 units: "m",
 maxResolution: 156543.0339,
maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34, 20037508.34, 
20037508.34),
controls: [],//on les définit plus loin
numZoomLevels: 20
        };

What could be the problem?
Thanks
Steve
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