>Specifying the full path is a possibility, however, this form has worked in another vfp9 application with this code. It also has worked in vfp7 applications. Why do some tables process correctly and others do not?

USE (m.lcDBF) in SELECT(1) ALIAS RndxDBF EXCLUSIVE

Perhaps you mean to open every table aliased as RndxDBF? If so, you should use

USE (m.lcDBF) in SELECT(SELECT("RndxDBF")) ALIAS RndxDBF EXCLUSIVE
SELECT RndxDBF

If you still get an Alias not found, look in the cdx tags. Don't use aliases in the cdx tags.