IE8 map graphics not loading due to js error

can you try this patch please : https://drupal.org/node/1364304#comment-5338260

Well that's a start, Are you using virtual earth layers ? we had problems with thoses. Could you try the default OSM layer ?

Well 1000 markers is a lot and IE is not the fastest kid on the block either. Have you tried cluster behavior ? You might have some success reducing the number of results you display, 1000 sounds like an awful lot of points to show, is it still usable with that much data ?

If it's still slow with that you might have to consider ditching openlayers and rolling your own map based on gmap and it's cluster behavior. OL, and browsers in general, are still not ready to handle lots of data points the way it's done here.

If you use chrome to display your map is it still dead slow ?

If that's a perf issue, it becomes a duplicate of #1370536: Display thousands of entries. I'll leave it open in case the problem is elsewhere.

Please note that this limitation is with web mapping in general, and switching to GMap may get some more performance, but you will still run into these problems.

The better approach, IMO, is either use something like TileMill to put data into raster format. Or think of a user experience that doesnt show that much data to the user all at one time.

I have the same problem with only one marker sob!!, tried to apply the #1 patch without results, very big problem:

$items = array();
$openlayers_maps = new stdClass;
$openlayers_maps->disabled = FALSE; /* Edit this to true to make a default openlayers_maps disabled initially */
$openlayers_maps->api_version = 1;
$openlayers_maps->name = 'agencies';
$openlayers_maps->title = 'Angencies Map';
$openlayers_maps->description = 'Map of Catholic Charities NY Agencies';
$openlayers_maps->data = array(
  'width' => 'auto',
  'height' => '400px',
  'image_path' => 'sites/annualreport2011.catholiccharitiesny.org/modules/openlayers/themes/default_dark/img/',
  'css_path' => 'sites/annualreport2011.catholiccharitiesny.org/modules/openlayers/themes/default_dark/style.css',
  'proxy_host' => '',
  'hide_empty_map' => 0,
  'center' => array(
    'initial' => array(
      'centerpoint' => '-73.885092142976, 40.756592141546',
      'zoom' => '11',
    ),
    'restrict' => array(
      'restrictextent' => 0,
      'restrictedExtent' => '',
    ),
  ),
  'behaviors' => array(
    'openlayers_behavior_dragpan' => array(),
    'openlayers_behavior_navigation' => array(
      'zoomWheelEnabled' => 1,
      'zoomBoxEnabled' => 1,
      'documentDrag' => 1,
    ),
    'openlayers_behavior_permalink' => array(
      'anchor' => 1,
    ),
    'openlayers_behavior_popup' => array(
      'layers' => array(
        'agencies_map_openlayers_1' => 'agencies_map_openlayers_1',
      ),
    ),
    'openlayers_behavior_zoompanel' => array(),
  ),
  'default_layer' => 'google_normal',
  'layers' => array(
    'google_normal' => 'google_normal',
    'agencies_map_openlayers_1' => 'agencies_map_openlayers_1',
  ),
  'layer_weight' => array(
    'agencies_map_openlayers_1' => '0',
    'ol_locator_proximity_search_openlayers_1' => '0',
    'openlayers_geojson_picture_this' => '0',
    'geofield_formatter' => '0',
  ),
  'layer_styles' => array(
    'geofield_formatter' => '0',
    'openlayers_geojson_picture_this' => '0',
    'ol_locator_proximity_search_openlayers_1' => 'default_marker_black',
    'agencies_map_openlayers_1' => 'default_marker_black',
  ),
  'layer_styles_select' => array(
    'geofield_formatter' => '0',
    'openlayers_geojson_picture_this' => '0',
    'ol_locator_proximity_search_openlayers_1' => 'default_marker_black',
    'agencies_map_openlayers_1' => 'default_marker_black',
  ),
  'layer_activated' => array(
    'agencies_map_openlayers_1' => 'agencies_map_openlayers_1',
    'geofield_formatter' => 0,
    'openlayers_geojson_picture_this' => 0,
    'ol_locator_proximity_search_openlayers_1' => 0,
  ),
  'layer_switcher' => array(
    'agencies_map_openlayers_1' => 'agencies_map_openlayers_1',
    'geofield_formatter' => 0,
    'openlayers_geojson_picture_this' => 0,
    'ol_locator_proximity_search_openlayers_1' => 0,
  ),
  'projection' => '900913',
  'displayProjection' => '4326',
  'styles' => array(
    'default' => 'default_marker_black',
    'select' => 'default_marker_black',
    'temporary' => 'default_marker_black',
  ),
  'map_name' => 'agencies',
);
$items["agencies"] = $openlayers_maps;
return $items;

For me was really something stupid, there was in the "default_dark" theme a img/blank.gif white instead of transparent and the top layer was hiding the google map!!! However the patch solved the error message, thanks.
Solved for me, switched to support request.

Yeah, the blank.gif image thing should have been fixed here: #1364304: Blank Google Map in IE9, but works in FireFox, Chrome etc.

Let me know if this solves your issue. Closing for now.