I have a new machine with fresh installs of win10 pro and office 2016. an old annoyance has survived the transition. in Excel, occasionally an error message pops up "there's a problem with the clipboard but you can still paste your content within this workbook." after this, the paste occurs but the workbook is then frozen, not responsive to keyboard or mouse inputs. other workbooks still respond normally. the only fix I've found so far is to restart Excel. this was occurring in the previous 2013 install on another machine. I ran a clear clipboard routine with no effect. this occurs when pasting between workbooks and within a workbook. any thoughts?