paste fails when try to run wiith excel multiple instances <p>I have 3 instances of Excel-vba running at same time. Sometimes, just sometimes, the Copy &amp; paste fails. When fails, I just run this part of the code again and it runs well. It can happen with any Paste method of my code. </p> <p>I know that it happens just with multiple instances of excel, I want to know why. Glad for help!</p> <pre><code>'Copy to a new Sheet Call findAndSelectRange("Fabricante", "Grand Total", 5) ' make one selection Selection.Copy Workbooks("FFQ.xlsm").Activate Sheets.Add After:=Workbooks(WORKBOOK_MAIN).Sheets(Workbooks(WORKBOOK_MAIN).Sheets.count) ActiveSheet.Name = sheetName1 'ThisWorkbook.Worksheets.Select (ThisWorkbook.Worksheets.Count) Range("A2").Select ActiveSheet.Paste </code></pre>