I'm really banging my head against the wall on this. I've cloned table shipping files many times for many clients so am aware of the possible pitfalls when replacing "table" with "myclonedtablename". I'm pretty sure I have't missed any instance of table or TABLE that should have been changed and I'm pretty sure I didn't accidentally replace a "table" or "TABLE" that shouldn't have been changed. I also did clone the appropriate language file.

The thing is that the module works but the zone selector doesn't appear in the edit window in admin. There's just a box with no description or value. The box appears correctly in the default version from which I cloned my second shipping module. I've double checked the two files (original and clone) but can't find any differences other than the changed table/myclonedtable differences. I also uninstalled the cloned module and reinstalled it with no change.

Any thoughts on where to continue my investigation into this would be super helpful.

Thanks!