You say that it works when loaded on to the device using MapSource? In that case it cannot be the spaces themselves that is a problem, and I
made a fix for dealing with them that was included in that patch.

So how badly does it not work? Can you search for anything? Is it only
addresses you can't find?

Since a small map worked you may be able to find a group of tiles
that work and work out if there is a particular tile that makes it
go wrong.