It seems that certain characters in the search field get converted upon searching execution, resulting in zero results for pages > 1.
To reproduce - create a bunch of entries that all share a search term (such as @test.com as the email address)
Search on "test.com"
Several pages of results come back - all is good. However, now to go Page 2 (or click NEXT) - you see the search term has become "test-com", which returns no results. Looks like a search hook/filter has replaced '.' for '-'. This is surely a bug?
Great plugin tho! If this bug is fixed in the plus version, please let me know and I'll upgrade.