Here is a list of the items with their roamers. If you want to refresh how they load, then you can place all the buildings listed in below into your inventory, then re-place them in your yard.
This won't fix the current issue where roamers do not appear at all - the team is looking into that. It appears to be related to how far the gate moves from its original location. But just to be sure, set your Graphics to Hi, and have double wide paths at your gate, and a path leading from the items listed below, all the way to the entrance.
Scottland Yard - - Police
St. Louis Cemetery - - Ghost
St. Pancreas Hotel - - Chimney Sweep
Shark pool - - Shark
Racing Ostriches - - Ostrich
Water Path - - Swan
Camel - - Camel
Dragon - - Knight
Bagpiper - - Bagpiper
Scottish Bathers - - Lady Bathers