I have a problem when using WMS layers. I'm usin QGIS. I'm loading a WMS layer containing some aerial images. And then on top of it another WMS layer that contains information of the city, boundaries etc with labels. When I load the WMS layer with the labels, the background goes blank and I can't visualise the aerial images.
I've tried the same thing in Arc and works fine but I have to use QGIS.