Version of vendor daemon is too old

On a Mac running 10.13.4 I just upgraded to pgfortran 18.3, and updated my license.dat file. However, when I go to compile a test program I get:
pgf95 test.f
pgfortran: LICENSE MANAGER PROBLEM: Failed to checkout license
pgfortran: LICENSE MANAGER PROBLEM: Failed to checkout license
pgfortran: LICENSE MANAGER PROBLEM: Failed to checkout license
pgfortran: LICENSE MANAGER PROBLEM: Failed to checkout license
pgfortran: LICENSE MANAGER PROBLEM: Version of vendor daemon is too old.
Feature: pgfortran
License path: /opt/pgi/license.dat:
FlexNet Licensing error:-83,147

Killing the daemon and restarting the license manager solved the problem.

The 18.* compilers use the same license file as older releases,
but flexlm reported their utils had a security issue, so we restricted
18.* compilers and newer will need the 11.14.* release of pgroupd
or newer.

pgroupd -v

returns the version.

So if you use old versions of pgroupd, older compiler releases work,
but 18.* and newer fail.

A simple way to verify this is to edit the license file line
DAEMON pgroupd

to

DAEMON pgroupd /pgi_install_dir/linux86-64/18.3/bin/pgroupd

and then

export LM_LICENSE_FILE=/path/to/edited/license.dat
and the 18.3 compilers should now work.

But restarting the license service from the 18.3 release also fixes
the issue.

dave