I have tweaked Excel and made a lot of macros that make work easier. This morning the macros stopped working. My files are on a NAS drive and it was no longer a trusted location. There was no check box in explorer to remove MOTW. I chatted for about five hours with Microsoft support until I found a solution on the internet. I changed the internet settings (security, local intranet, sites, advanced settings) and added the IP address of the NAS drive there. Now the NAS is trusted and the macros work!