https://community.blueprism.com/t5/Product-Forum/Activate-Worksheet/m-p/47201#M2998 Are they any differences in code between Blue Prism versions 5.0.11.0 and 5.0.18.0. A Process developed on 5.0.11.0 and imported into 5.0.18.0 does not function the same. on the older version it works correctly, but, NOT on the newer version. ACTIVATE WORKSHEET(MS Excel VBO) is creating another INSTANCE of EXCEL. Within MS excel VBO, under the CheckInstanceAndWorkbook TAB , The code CHECKWORKBOOK , starts another Instance of EXCEL , then, the error "Workbook not Found" the same process runs without issue on 5.0.11.0 Sat, 11 Mar 2017 02:39:00 GMT RickMartin 2017-03-11T02:39:00Z https://community.blueprism.com/t5/Product-Forum/Activate-Worksheet/m-p/47201#M2998 Are they any differences in code between Blue Prism versions 5.0.11.0 and 5.0.18.0. A Process developed on 5.0.11.0 and imported into 5.0.18.0 does not function the same. on the older version it works correctly, but, NOT on the newer version. ACTIVATE WORKSHEET(MS Excel VBO) is creating another INSTANCE of EXCEL. Within MS excel VBO, under the CheckInstanceAndWorkbook TAB , The code CHECKWORKBOOK , starts another Instance of EXCEL , then, the error "Workbook not Found" the same process runs without issue on 5.0.11.0 Sat, 11 Mar 2017 02:39:00 GMT https://community.blueprism.com/t5/Product-Forum/Activate-Worksheet/m-p/47201#M2998 RickMartin 2017-03-11T02:39:00Z https://community.blueprism.com/t5/Product-Forum/Activate-Worksheet/m-p/47202#M2999 Both versions of Blue Prism use the same .NET Platform codebase, so there should be no difference to code between the two versions. Has anything else in your environment changed? (MS Excel VBO version, Excel versoin, Windows OS version, etc?). Tue, 04 Apr 2017 13:18:00 GMT https://community.blueprism.com/t5/Product-Forum/Activate-Worksheet/m-p/47202#M2999 Denis__Dennehy 2017-04-04T13:18:00Z