AVG Antivirus stopped LilyPond PDF generation

[Karlin High]

I am unsure which mailing list is best suited for this report. A 
LilyPond user called for help with errors of the following form:

"
Converting to `test.pdf'...

warning: `(gs -q -dNODISPLAY -dNOSAFER -dNOPAUSE -dBATCH 
-dAutoRotatePages=/None -dPrinted=false ./tmp--tmp-4710074)' failed (1)

fatal error: failed files: "C:/Users/user/Desktop/My songs/test.ly"

Exited with return code 1.
"

This is coming from Windows 10 Pro 21H1, LilyPond 2.23.3, Frescobaldi 
3.1.3. It looked to me like GhostScript was unable to write the PDF, the 
sort of error that would happen if directory permissions or file locking 
was interfering somehow.

But it turned out to be AVG Antivirus causing the PDF generation 
failure. Disabling the antivirus fixed the problem, PDFs would then 
generate just fine. Re-enabling the antivirus also re-enabled the problem.

The product was AVG Free 21.7.3196, definitions 21.7.3196. It has now 
been replaced, all seems OK, reporting this for future reference.
--
Karlin High
Missouri, USA