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Question: How do I stop symbols from disappearing in output?

Question:How do I stop symbols from disappearing in output?

Erik Engbrecht 5 Maple 14
output
March 12 2011
0

I'm using Maple 14 on OSX 10.5.8.  I have a lot of expressions that look like this:

sum(a[n+2]*x^n*(n+1)*(n+2), n = 1 .. infinity);

(which doesn't seem to be rendering here...so in 1D form)

sum(a[n+2]*x^n*(n+1)*(n+2), n = 1 .. infinity)

My problem is the when using default fonts and 100% zoom the plus signs in the subscripts aren't displayed.  If I increase the font size or zoom factor, the plus signs show up but the summation symbol goes away.  I've experimented different fonts and different sizes, but the behavior always seems to be the same.

Is there some setting that can fix this?

Here's what it looks like when not zoomed and zoomed:

 
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