There are rare reports on the largest of maps for AI or game crashing. I assume that this is due to some buffer overload. If you send me the map and a save just before it happens it will be very helpful for me to investigate.
Though chances for fix are slim.
The external manual is now updated for RC19i and supports 6 languages - English, French, Hungarian, Italian, Russian and Spanish.
The same translations are also available for the mod on moddb.