@asWAPL9 - this post has been edited due to Community Rules & Etiquette violation.
i cannot believe that it is 2023 and this problem is still not solved. Autodesk. it has been 17 years. what the actual heck?
I ran across the same issue. My work around was to:
I pcked a text type that I made and knew I could purge and could "Select All Instances" for (from trial and error). Then I took a screen shot the text type's parameter values.
Next I edited the text type I could not purge to have the same parameters values as the one I took a screenshot of.
Then I "Selected All Instances" for the text type I originally picked and screenshot. I changed them all to be the text type I could not purge. I then purged the original text type.
Finally I renamed the unpurgeable text type to the name of the original text type I just purged.
I don't see that unwanted text type name in my properties list anymore and everything is what it was before. Just somewhere in the project that I couldn't see or find anyways has some text that changed parameter values.
Dimensions don't use Text Styles, but Schedules do. Check the Schedules in your model and any View Templates for schedules.
Howard Munsell
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Nice! One of the two Text Styles I could not find using "Select All Instances" was indeed in a Schedule Template. There is still one more I cannot find to purge. I've looked at every View, Legend, Schedule, Schedule Template and Sheet. Any other ideas? Thanks
I figured out my problem. At some point while developing my Project Template I renamed the Text Type "Schedule Default" to something else. That something else happens to be the Text Type I can't Purge. I tried and I can't change the Text Type Revit defaults to when you first start a schedule. Thanks for leading me in the right direction.