Invisible Units not functional in 2nd Fleet

We are about to start a double blind game of 2nd Fleet, a module posted in the vassal module library. I am logged in as the moderator, and I placed some units on the map, marked them as invisible, and thought everything would be fine. The player whose units I hid, however, cannot see them. So, we did it in the reverse order – he placed them, then hid them, but I as the moderator cannot see them.

I read the module’s read me, searched the documentation a bit, as well as the forum, but I’m stumped. Help!

Well, it looks like the module was not designed per the fashion outlined in the documentation …

This calls for two separate maps, but the module has a single one. Does vassal presently have the capability to govern which players see which units all on a single map?