I seem to have a bug. When I purchase the Holomap on Desert Island the vendor takes my money, and the item disappears from the room. The problem comes from being unable to use the Holomap. The item does not appear in the inventory and using the keyboard short cuts has no effect (no Holomap is opened).

Never heard of that, you should ask here: http://forum.magicball.net/forumdisplay.php?f=7

Thanks. Hopefully I'll get some help.