I use excel so much, that in excel 2003, I had created macros, all they did was open a particular file, and then i created custom toolbar buttons, so that for each file that I used often, I had a toolbar button that if clicked, would open a file. when I started using 2007, on the addin tab, my custom toolbars from 2003 show up. Now all of a sudden, if I click on the toolbar button, I get an Microsoft visual basic error message, all it says is "400". Any advice or resources anyone can offer?