The complete uninstall and new re-install have been tried to no avail.
The computer details: OptiPlex 7070, i7-9700, 48GB RAM, Windows 10 Pro x 64bit.
Both Quartus versions compilations worked well on laptop computer Lenovo T430, i7-3520M, 16GB RAM, Windows 7 Enterprise x 64bit.
Can you attached your design.qar files for us to duplicate the issue? You can check your email if you not willing to share it publicly.
Work privately in email.
For more complete information about compiler optimizations, see our Optimization Notice.