check a few things first:
1- do you have xrefs? If so, the text style may be in that file
2- so you have blocks not created by you? if so, the font may also be in there.
3-have you purged? if not do so clicking "confirm each item" and "purge nested items".
Once this is done, build a selection set, by text style, then ERASE, P (for previous) and enter.
if that does not work, you may need to rename the text style and then purge again.
okay, try this...
1-open your dwt
2-RENAME, text style, select each style to rename, rename it to something else, (you need to pick each one individually and be sure to click "rename to")
if that does not work, I am lost! hope this solves your problem
okay, i have messed around with this and think i have a soluiton...
go to windows explorer, crogram files (or where ever your program files are located), go to autodesk (or autocad, depending on how your system is set up), fonts. in this folder, you should see your fonts for cad.
Now, I know you probably already that, so now do this:
go to the same file your fonts are located in (crogram files\autocad
createa a folder called "fonts 2", go to your original fonts folder, and click on the top font file and then scroll to the bottom fo the file and hold shift and click the last font file.
right click and "cut"
then go to fonts 2 folder and paste them there by right clicking and "paste".
now delete the original fonts folder
then rename the fonts 2 folder to fonts.
exit from any autocad session(s) open and reopen.
check your dwt and see if this corrected the issue. if not:
go to options, file, working support file path, and see where you are pathed for your fonts. if the path is not where you just deleted renamed the folder, add it or repath the fonts path currently in your settings. then restart cad.
Using windows explorer search for *.ttf search "my computer" then move all ttf files you don't want to a temp directory Open ACAD and see if you get the substitute font dialogue box. That should at least let you choose a fon't that you do want to use for any style that is defined.