AirNav,
Just for information. This morning after starting using RB I noticed I was getting regular grey lines across the map screen and it was getting very regular. I was not using recording but had Share and Network traffic switched on. I turned both of these off but this did not stop the lines. I then re-arranged some of the other equipment near to the RB and its aerial and realised that the radio I use in my den, a Sony Ericsson W850i in a Speaker cradle was very near the aerial. I removed this device from the area of RB and the grey lines dissappeared. It would appear, that for me at least, the grey lines were caused by interference with signals by another electrical device. OOOOppps :-(