https://community.blueprism.com/t5/Product-Forum/MS-Excel-strange-behaviour/m-p/52989#M7773 Can you explain more detail/add screenshots, we have seen issues recently where if you don't ""Show"" the workbook then you get errors, try this and see how you get on. It only started happening when we changed from Office 2010 to 2016 Cheers Connor Thu, 04 Oct 2018 12:07:00 GMT ConnorTickhill 2018-10-04T12:07:00Z https://community.blueprism.com/t5/Product-Forum/MS-Excel-strange-behaviour/m-p/52988#M7772   Good afternoon,   After upgrading our system to 6.3 we are experiencing some strange behaviours with MS Excel VBO. First of all is when we try to open a workbook( The workbook exists, the create instance actions has been done and we got the Handle) the stage throws an: The stage has thrown an exception. This error happens again with Write collection to excel. We are using excel 2013 and we have checked in two different computers and both of them have the same errors. Is this a known bug or it is just us?   Best,  Wed, 03 Oct 2018 18:08:00 GMT https://community.blueprism.com/t5/Product-Forum/MS-Excel-strange-behaviour/m-p/52988#M7772 Anonymous 2018-10-03T18:08:00Z https://community.blueprism.com/t5/Product-Forum/MS-Excel-strange-behaviour/m-p/52989#M7773 Can you explain more detail/add screenshots, we have seen issues recently where if you don't ""Show"" the workbook then you get errors, try this and see how you get on. It only started happening when we changed from Office 2010 to 2016 Cheers Connor Thu, 04 Oct 2018 12:07:00 GMT https://community.blueprism.com/t5/Product-Forum/MS-Excel-strange-behaviour/m-p/52989#M7773 ConnorTickhill 2018-10-04T12:07:00Z https://community.blueprism.com/t5/Product-Forum/MS-Excel-strange-behaviour/m-p/52990#M7774 It's because of your region settings. Try using Match Windows display language on your region settings. I had the same issue and the error was about invocation. Tue, 27 Nov 2018 23:52:00 GMT https://community.blueprism.com/t5/Product-Forum/MS-Excel-strange-behaviour/m-p/52990#M7774 DenizKilinc 2018-11-27T23:52:00Z