It's a problem with the hinting.
If you're making bitmap files, the answer is simple: just work larger and scale down.
Play around with different screen magnification -- with the exception of fonts which have been painstakingly hinted size-by-size for screen (and there are very few of these) most fonts have non-size-specific hinting instructions which fall victim to glitches at certain sizes.

Thanks a lot Nick. That's a great insight.

Is there any way to address the same problem on an in-house powerpoint; for instance, where it's still text and not an image?

This is quite obviously a bug in the font's hinting. I think this is something that the font vendor (DTL) should fix. So I'd recommend asking DTL for a corrected version.

Regards,
Adam

Twardoch - Thanks very much. I guess that would be the easiest solution.