Some issues or problems which may occur when working with Excel, submitted by program interfaces of thrid party software providers. The add-in technology provides an interaction between Excel and other programs. For a failure analysis, it may be useful to disable the add-ins in order to exclude as the cause. The add-in management is also available in other Office applications like Access and Visio.
In a normal case is it unknown for Excel users, that macros and add-ins / add-ons can be dangerous in Excel spreedsheets. Therefore, Excel includes functions for adjusting the data access security. Additional programs (add-ins) does not work with incorrect settings. With Office CleanUP it's very comfortable to reconfigure the default security settings. Security levels like Low, Medium, High or Very High can be activated with just a click! The default security is"High". A special setting is the trust of execution of Visual Basic for Application Excel macros, which can be restricted or released.