apostrophe turning into question mark?

[sigmond]

So lately whenever I start a thread each apostrophe transforms into a question mark. I remember having this problem in the past but have forgotten how to fix it.

suggestions?

Thanks

example: Apostrophes-in-abundance

 

[Tranced]

Related reading: http://www.bluelight.org/vb/threads...racter-Question-Marks-and-Diamond-error-icons