Works for me in CTA, CT6, IClone, even Magix Musicmaker, but I uninstalled some other software being related to those voices - something used those and locked them somehow.
One reader was behaving odd for me and crashing a lot, so I uninstalled that - Some readers using the voices can claim full control, so I would consider that as the problem. Just uninstall any extra readers you got and proberly don't need. (AbleReader works)
And restart your computer for letting Windows clean up the mess...
Those voices are meant to be available to all programs that can use them.
Hope this helps.