No, my application works fine other than this view.

This code works only when both parameters are blank! (It does work in the Studio!!)

Code:
SELECT Name, M_Addr, M_City, M_St, M_Zipcode
FROM BillInfo
WHERE CASE
   WHEN ${State} <> '' AND ${City} <> '' THEN M_City = ${City} AND M_St = ${State}
   WHEN ${State} <> '' AND ${City} = '' THEN M_St = ${State}
   WHEN ${State} = '' AND ${City} <> '' THEN M_City = ${City}
   ELSE M_City > '' AND M_St > ''
END
ORDER BY CASE
   WHEN ${State} = '' THEN M_St
   ELSE Name
END, Name