Bmapper Map Capture

I've tried several times to capture a map of north Texas from SeeYou
by carefully following the directions contained in Bmapper. However,
all I get is a blank screen in Bmapper when I select what appears to
be a successfully selected area map. I think the instructions in
Bmapper may be incomplete--it appears that you must perform the
capture attempt with raster maps displayed, but I'm not sure. I also
wonder what type of raster map must be displayed in SeeYou for this
capture attempt to be successful. The Bmapper website has no tech
support (understandably so for a free and much-appreciated program),
so I'm asking the group!