If I change to your suggested:
/%year%/%monthnum%/%day%/%postname%/
…pagination works fine.
I’ve tried with all plugins disabled, including plugins your theme requires, and it has no impact on the pagination when using:
/%category%/%postname%/
…for a permalink structure.
However, I have to use that permalink structure, as the category represents each state, and the postname is the physical address of properties for sale.
Why would pagination work with year, month, day & postname, but not category & postname?