Problem changing font on Userform

[John Crawford]

I have a userform that opens during a presentation. On the form is a
label. The font for the label is set to Tahoma.
Now, I want to be able to change the font to "Math B". I can appear to
make the change. If I look at the font name after the change it says
"Math B", however the text in the label does not change. I tried a
number of other fonts, and fonts that have valid text (like Courier,
Ariel) work ok. All the Math fonts, and a couple of 'graphics' fonts
(Computers, Arrows1) that I tried do not work.
Is there something that I need to do to 'refresh' a graphics font, or am
I out of luck?
Any guidance would be appreciated.
Thanks
John Crawford