Had the same problem. If you uses danish chars like 'æ'
'ø' and 'å' the letter spacing is completly wrong. The
solution is to save your PowerPoint in the old ppt format before
you export using Presenter. Then the font kerning will be ok.
There still seems to be some bugs when you use the new pptx
Powerpoint format, i sure hope Adobe is working on some fixes for
that.
Cheers
Ole