Hyperlink Issue/Formatting Problem

[Excel_Wizard]

Hey There,

I am experiencing an issue within an Excel workbook dealing with hyper links. I have created a navigation tab with links to all the other tabs within the workbook. I added "Home" links in the top left corner of every tab that links back to the main "Nav" tab. Every time I open the tab, the formatting and hyper link in the top left corner on each tab has been removed. The text is still there, but nothing else (no formatting, color....etc). Any ideas of what could be causing this? Maybe the macros running within the workbook?

Thanks everyone!