Try changing the font download to Complete and check the box to download PPD fonts.
IIRC, the earlier versions of Optima were a big problem. I strongly
suggest upgrading to the OpenType version.
Other things to try:
Examine your specific version of Optima by going to Type menu > Find Font, clicking on the Optima font and choosing More Info (I think) and find the specific version number. See if you can uninstall the font and reinstall another Optima font with a different, preferably newer version number. There has (historically) been a bad version of Optima floating around for years. Maybe you have it.
Use a free utility like FontNuke or FontFinagler to get your Mac OS to reset its font plists. Sometimes that makes the OS feel better.
Use the built-in Disk Utility to repair file permissions. You never know.
Export your old document out to IDML and reopen that resulting idml file back into a new freshly written INDD file. This might remove internal database corruptions.
All these are chicken-soup things to try and they might be good for you.
Mike Witherell in Florida
Thank you all for your suggestions. I will get the user to try these and see which helps!