Rough week, too many questions! Customer is on v2016 Premium with Sage Intelligence. Received a new computer a few months ago and doesn't think she's had to access Trees in SI since receiving computer. This week she has to make changes to the Trees. She can run the report (both existing report and a new template) and can do anything (launch the built in layouts, bring over the Accounts from the Task Pane, add a formula). However, when she goes to Manage Trees, either Edit, Add, Copy (any option), she gets the Microsoft .Net error in the JPG attached and the whole error is in the PDF. IT uninstalled the .Net features, uninstalled wksetup, rebooted, installed .Net, wksetup (all as Admin), UAC is turned off and still we get the errors. Excel is Office 365 v2016 (desktop, not web), .Net is 4.7.1. We confirmed the Prerequisites today. The only thing I haven't done is have them repair Office. If I click the Continue button in the error, Excel crashes. Anyone seen this or have any ideas? She is the only user so unable to test another machine without moving licenses.