in a part's Properties, we've been using <MOD-DEG> to show the degree symbol; in SW2020, it simply shows that HTML code.
Worse, in a hole callout, we have the diameter symbol Ø but that shows on the print as the HTML <MOD-DIAM>
Out of curiosity, from which release did you upgrade? More than a few releases ago (SW2014), SOLIDWORKS started to allow users to define the location of their GTOL.SYM file (file where all the symbols are defined). If you are updating your install to a newer version of SOLIDWORKS but still have a really old release somewhere on the system, SOLIDWORKS may have picked up on the old location for your GTOL.SYM file. Please see this article for details: Why are my symbols missing?
Unlikely it's an ancient GTOL.SYM file--updated from 2019, which was updated from 2018, rinse and repeat for many generations. Also, the PC's not all that old. But, with luck, the article you linked will help. And, I'll search for GTOL.SYM files.
That was it--File Locations pointed to a location w/o GTOL.SYM; redirected it to the relevant SW2020 folder and Bob's your uncle!
Search for MOD-DIAM
Lots of results.
Did you custom or modify your gtol.sym?
I have this happen every so often. I can't explain why.
Maybe the "why are my symbols missing" article Matthew linked in his reply to me will help. I was thinking that perhaps several *identical* copies of GTOL.SYM could help. I'm somewhat bemused in that it seems the install of 2020 deleted the GTOL.SYM file from the 2019 folder, but did not update the relevant File Locations entry--on my machine. On others here, all of which were ghosted from the same image file originally, this evidently didn't happen.
Make sure your settings are pointing to the correct location for the gtol.sym file (and other files).
Sounds like the system is not finding the file.
(EDIT: Hadn't refreshed my screen from when I opened it and see that this has already been answered)
Retrieving data ...