I included sector exports in the description for you to use to recreate the problem.
**1.** Import TheHub.smsec to sector 50 50 50.
**2.** Run a /force_save, wait a bit for it to complete. Then export sector 50 50 50 to "TheHub-whatever". (Command: /export_sector 50 50 50 TheHub-whatever)
**3.** Try to import the export you just made. /import_sector 60 60 60 TheHub-whatever
It should fail with a class cast exception.