[OpenLayers-Users] WMS layer not visible...

[Phil Scadden]

You should always use maxExtent - if you dont OL guesses which I think 
works okay if the map projection is 4326 or 900913 in 2.12. MaxExtent is 
used in calculating whether to make WMS calls (is the layer in range). A 
mismatch in the projection information between the WMS layer, map 
projection and baseLayer projection is probably cause of havoc.

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