Hi all,

I'm having this error lately, driving me mad.

The map works fine mostly, unless I zoom in to the last few level.
After zoomed in, the error starts popping up. The error persists with
or without using sperical mercator. Below are the settings of
TileCache and OpenLayers.


TileCache:
[4326en]
type=WMSLayer
url=http://localhost/wms.php?lang=en
layers=national_border
extension=png
metaSize=10,10
sendfile=yes
metaTile=true
#extent_type=loose
bbox=-180,-90,180,90
#spherical_mercator=true
resolutions=1.40625,0.703125,0.3515625,0.17578125,0.087890625,0.0439453125,0.02197265625,0.010986328125,0.0054931640625,0.00274658203125,0.001373291015625,0.0006866455078125,0.00034332275390625,0.000171661376953125,0.0000858306884765625,0.00004291534423828125,0.00002145767211914062,0.00001072883605957031,0.00000536441802978515,0.00000268220901489257,0.0000013411045074462891,0.00000067055225372314453


OpenLayers:
        var options4326 =
        {
                resolutions: 
[0.17578125,0.0439453125,0.0054931640625,0.00274658203125,0.001373291015625,0.0006866455078125,0.00034332275390625,0.000171661376953125,0.0000858306884765625,0.00004291534423828125,0.00001072883605957031,0.00000536441802978515,0.00000268220901489257],
                maxExtent: new OpenLayers.Bounds(-180,-90,180,90),
                projection:"EPSG:4326",
                controls: []
        };
        g_map = new OpenLayers.Map('map', options4326); 
        var bg = new OpenLayers.Layer.WMS("Base", tclinks,
                    {layers:'4326en',format:'image/png'
                     /*,sphericalMercator:true*/},
                    {transitionEffect: 'resize'});
        g_map.addLayer(bg);
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