pdfroff generating blank output

[John Ousterhout]

As  of this morning the behavior of pdfroff under Cygwin seems to have
changed for me: the PDF output that it produces is (often) blank:
* It seems to have the right number of pages, but all of the pages are blank.
* I tried several different viewers including Adobe Acrobat, the PDF
displayer in Firefox, and the PDF displayer in VSCode; all show the
same blank output.
* Historically pdfroff has worked consistently for me with no
problems. Files that produce blank output today worked fine in the
past (perhaps a few months ago?).
* The behavior is not totally consistent: some files still work while
others don't. After poking around a bit, I was able to find a
single-line change that flips the behavior between working and not
working. I have attached the file (homa.7), which can be compiled with
"pdfroff -man homa.7 > homa.pdf". In its current form, this file
generates blank output for me. But, if I delete line 561 (".IR
max_incoming /(N+1).") then the file generates viewable output.
* In cases where the output is blank, I tried using "groff -T ascii"
instead, and this produces fine output.

I am also attaching output from "cygcheck -s -v -r > cygcheck.out", in
case that sheds some light.

Any help would be much appreciated; is it possible that I am doing
something wrong?

-John-
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