Text color turns black when exported to pdf...

I've been using Adobe products forever and this one has me stumped.
 
For some reason, just in the past couple of weeks, any text that has color applied to it turns black (100% K) when exported as PDF. Doesn't matter what app I'm exporting from (Quark, Indesign, PS, etc) or what the color is (a cmyk or spot). Doesn't matter if it's a direct "export to pdf" or via a ps file through Distiller. Still turns black. Also does not matter what the font is, new or old, ttf or ot.
 
The colors separate fine directly from the app they were created in. It's only when exported to PDF (or as ps to Distiller) that the text colors go black. IF the text is in AI, and converted to outlines, the colors export fine.
 
This is occurring on an Intel iMac, OS 10.6.6, using CS5 version of Acrobat Pro (v 9.4.2).
 
Because this just started happening a couple of weeks ago, I'm thinking some upgrade or patch may have thrown settings out of whack. Regardless, I'm really stymied (and a bit desperate!). Any advice/suggestions?
 
Thank you very much.
 
Susan