The file doesn't show any lag when I type into it so I still don't think the styles are the issue.

I'm still of the opinion the problem lies in your attached template or addins. Since you have some files that don't lag and others that do - this is a strong indication that the attached template is the issue rather than an addin.

Your profile says you are using Office 2007 but the attached template is a dot file (the old file format). Perhaps you should try changing the attached template to see if the speed returns.

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Andrew Lockton
Chrysalis Design, Melbourne Australia