CorelDraw X6/64-bit Font Issues

I'm working on a complex document with a lot of text. It was first created with X5. When I opened it in X6, there was a bar near the top that asked to "update" the fonts. I indicated "yes". I worked on the document for about 4 hours, and then saved it and exited CorelDraw. Today when I first opened the document, the fonts are corrupted - capital letters where lowercase should be, spacing is random - some characters on top of others and some too far apart. I closed the document, re-booted my computer and reloaded the document. Now the there is still corruption, but it's different - different letters are capitalized and there are different spacing problems.

 

What can I do to fix this??

 

bert

Follow Up: It appears that this problem occurs only with SmallCaps.