If I export or print Keynote to PDF fonts go from black to white

If I export OR print a keynote to PDF the fonts go from black to white.

If I export to PPT they remain black.

If I export to PPT then save as from PPT to PDF they remain black.

If I send directly to printer they print black.

But, again, if I export or print from Keynote to PDF the black fonts go white!!

Is there a workaround or something I can do?

Is this a known bug?

R

Snow Leopard -- Keynote '09 -- 5.1.1