Created attachment 346002 [details] black holes black holes on screen.
This is due to OpenGFX not being complete yet. The black holes you are seeing are just sprites that aren't there yet. However there are only few sprites missing. You can check the progress of the OpenGFX project at http://wiki.openttd.org/Graphics_Replacement If you own the original TTD you can use the graphics files that come with it to get the full experience :P Closing this as NOTABUG