Error "Number is invalid" when changing text size

[nordeide]

Hi,

I have a PC with XP Pro SP2, Offixe XP SP3 and Viso 2003 SP1.
When I create a text box in Viso 2003, I can write text without problem, but
if I try to change the font or text size, either by selecting font/size
before typing, or by selecting text and then try to change the attributes, I
get the error message

"The number is invalid."

(Actually, this is the Norwegian version of Visio, so the actual error is
"Tallet er ugyldig", for those who can read Norwegian.)

As a result, I'm stuck with Arial 12 for any text box... Also, it's
impossible to change font/size in existing text boxes.

Any help would be greatly appreciated! Thanks in advance!