[OpenLayers-Users] Problems to by error-images

[Jan Tappenbeck]

  Hi !

we have a project in this url: 
http://www.ferrylines.com/fileadmin/osm-ferry-v2/deu/ferry_iframe.php?id=1&iscale=0

when you zoom into the map and the level is 7 (not show in website) 
there will come images that will not show. the image is not avaible!

in css-file 
http://www.ferrylines.com/fileadmin/osm-ferry-v2/css/style.css there was 
a command

.olImageLoadError {
     display: none !important;
}


but when this is active - in firefox no map will show.

the used ol-version is 2.12.

did someone have an idea ?? in the past the map will work fine. is this 
a problem of firefox-versions? i used 38.0.5

regards Jan