I've been through the registry and set BIGenartor to 3, uninstalled, reinstalled workstation setup, checked permissions, security, UAC, run SI Hotfix 27868, verified and reinstalled MS Visual Studio 2010 Tools, MS SQL Server Compact 3.5 SP2, Visual Studio Tools for Office Runtime 3.0. Sometimes, an SI Report Designer report will open and be fine, that's the exception and not the rule. In attached screen shot, you can see all three add-ons are 'enabled' but #name shows in the cells. On the last reinstall the path for Report Designer Add-in 1.2.0 (Custom Task Pane Helper) no longer shows. I've done an uncheck, add, browse to try and restore that, but no luck (and it doesn't' seem to affect another workstation that also doesn't have the path for this). A little digging on MS site reported an xll issue with macro buttons but I can't see anything else reported about add-ons for Excel 2016, Windows 7 64-bit.