We are seeing strange results in Excel after the Sept 8, 2015 "Security Update for Microsoft Excel 2013 (KB3085502) 32-Bit Edition" update. When a vba macro changes the sheet, the formula bar does not change to the cell on the new sheet and it gets locked up. Then changing something in the formula bar changes the cell on a different sheet. There is a disconnect between the formula bar and cells. Uninstalling the update fixes every computer that we use.
This Microsoft update is causing problems that Microsoft needs to address.