Geeze, what a journey!
So, on submitting a job through backburner after the update to 3DS Max 2016 SP2 (but see later!) I was getting an error from all 3 of my network machines, saying "3dsmax.exe no response" with an error code of -2 unexpected error.
This had me scratching my head. A message would have been something like "Mismatched version" as the update had NOT run on those 3 machines.
Some way of knowing what version was installed would be good (anyone know of one?) 3DS Max only runs direct as an expired trial on the servers, so I have no way to run it there and click on About to see what version is installed.
Anyway, turns out the update program had not run. Not sure why. It ran, then vanished from my remote access screens, and I shut everything done thinking "Success!" So today I deleted the "Autodesk" folder on the C drive of every machine (just installation files, redundant once install is done) as I noticed they were all old and not from the recent run of updates.
Then I re-ran the update... only this time I noticed a "Do you want this program to make changes on this machine?" dialog that I hadn't seen before. Had I not noticed as I'd minimized or closed out the remote access and it had vamoosed down to the task bar? Not sure, can't say how I missed it THREE times, once on every machine.
So this time I confirmed yes, of course I bloody do, that's why I ran the program. Big clue is that it takes about an hour to run the update, and if it finishes pretty quickly, something is wrong!
Documentation on Backburner and it's problems are a bit scant, along with the error messages being unhelpful - "Wrong version" would have told me straight away what was up.
Anyway, this seems to have resolved it - now to see if Scanline and MentalRay are working at normal speeds over the network! UPDATE - they do! Thank goodness!