Invisibles font disappears after installing QuarkXPress update 9.5.4.1

Always happy to install updates that improve functionality, this time, I have more work instead of less. After installing this most recent update, Invisibles disappeared from Quark pages and became actually, well, invisible. I tried FontNuke to remove caches. I've tried moving (copying) the QuarkInvistibles.TTF to the Fonts directory. I've made sure it is visible and active in FontBook. I've rebooted multiple times. Still no invisbiles. There seems to be no further information on this topic in the Knowedgebase. Perhaps this is a problem unique to my system, perhaps not. And, of course, free support is gone. Thanks, Quark. You've helped a lot. (MacOS 10.8.5)