Text box problems

[jimbo345]

I have a user on Office 2003 who has created spreadsheets with a text box
header that looks correct when opened in 2003. When a user on Excel 2007
opens the document, the text in the text box is shown as underlined and with
a strikethrough effect.

Although the 2007 user can manually change the settings, is there anyway to
stop this from happening?

thanks in advance,