Edit: This seems to be associated with incorrect Google sat version number. It happens when it fails to download a tile and it uses a blank tile. Maybe when it gets a correct image, that overwrites the screen region. Maybe the fix is to just erase the screen region when it fails to download a tile.
Default maps now show road linze drawings when there is no satellite image. Zoom in (an area that has roads) using the '+' button (slowly. wait for redraw at each click). The roads and text are not erased and build up more and more with each zoom, until you get to where there is a satellite image, at which point it works correctly.
Other things too, like rip map highlighted area does not get "unhighlighted" when you highlight another area after ripping the first area (like it does when there is real satellite imagery). Actually, I like that when ripping maps. Happens in relation to using the "+" to zoom in.
Tested in Win7 and Linux (Mint Mate == Ubuntu)