Paint Shop Pro :: OpenType Fonts Exist But Suddenly Invisible In X4?

I have been using PSP X4 for over a year with OpenType fonts. Suddenly this morning, all OTF have quit working in PSP, but TrueType fonts work just fine. I can choose an OTF from the font name window and see the first 6 character preview. However, when I type, there is nothing visible with the OTF. The cursor moves, but nothing shows. After I have typed with the invisible OTF, the text box exists in the appropriate size for what I have typed, but you can't see anything -- completely invisible. I can highlight my invisible OTF typing and change it to TrueType, and the text is there. Likewise, I can type in a TTF, highlight my typing and change it to an OTF and the text becomes invisible.

So PSP is recognizing the text, it just won't display it in OTF.

I can open previously-created files that used OTF in the text, and the OTF text is not visible, either.

I've never had any problem with OpenType fonts in PSP before -- they've always worked just like the TrueType for me.

The OTFs work fine in all other programs on my computer -- only problem with OTF is in PSP.