Hello Mark Hessling, All, Do you have any idea what caused such an error is returned by rexxsql.dll ? More info is in the subject line. This consistently occurs on only one PC, running Windows 10, with 16Gb RAM, more than 4Gb RAM available. The Rexx engine is OORexx version 4.2.0 from Feb. 22, 2014. The Oracle client: Release 12.2.0.1.0 Prod. Any info and help will be much appreciated. -Simon in Nashville, Tennessee