Originally Posted by mtravellerh
Could it be that you simply use another font? Or maybe you have changed the default language?
Another Mobipocket Reader font perhaps, but I opened both .prc ebooks (ver 2.0 and ver 2.1) with the same updated Reader and the images show the differences.
Mobipocket Creator language setting may have changed from 'en-us' to 'none', but I think Creator must be at fault. Here's a .prc I created from the above HTML code for "Frequent".
Can you see if it renders properly on your system (and upload it here/state which build)?