It's widely known that after you install software you should - reboot.
While many application function at one hundred percent right after install, some do not.
noMachine is like that it would seem. Thanks to @stacksofplates for mentioning this simple but very effective fact.
While I had installed noMachine, I hadn't performed that task on either the host or viewer.
Thus far - it's been working as designed and across platforms. I still need to test via the iPad - where I had had so much issue previously.
Thanks again -