If layer hasn't tilesSize/imageSize options it copies from map.baseLayer/map
Did you set tileSize for map and every layer?
What do you mean background (it's just a one layer)? 
I'm using OL 2.8 for a long time with raster base layers and transparent
vector layer (both from mapserver)
and I have no problems. 
OL getURL function result independent from level both for wms and mapserver
layers

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