CorelDraw corrupting system font file

When I use CorelDraw X6, the Times New Roman normal font file becomes corrupt and is replaced by italics.

Once corrupted, all other programs using Times New Roman (e.g., Word, Outlook) show only italics font.

This is the only way to make this happen - no other programs or activities cause this problem.

The problem is consistent it happens every time.  (I've resorted to leaving the Times New Roman font installation file on the desktop and just re-install fonts after each CorelDraw session).

I've uninstalled and re-installed the Corel suite with no effect.

Has anyone else experienced a similar problem?

-Kurt