I have two Macs, a 2015 MBP, and a 2013 Mac Pro. Both were running Fusion 8.1.1 on El Capitan, with nary a problem. I have a total of 6 VM's of different varieties, two on the MBP (OSX 10.10.5 and Debian 8), and four on the Mac Pro (OSX 10.9.5, 10.10.5, 10.11.6, and Windows 10 with the new edition upgrade). All of these were working flawlessly on El Capitan, with Fusion 8.1.1.
Now I have upgraded both machines to Sierra, and installed Fusion 8.5.0. Every one of my virtual machines gives the "Internal Error" message when I try to run it. I completely uninstalled 8.5.0 on both machines (tracked down every little file that VMWare leaves behind and deleted it), and then installed Fusion 8.1.1 on both machines. I get the same "Internal Error" when trying to run any of my VM's. It seems there is some issue between Fusion 8.x and Sierra. Strange that the behavior is identical on two different pieces of hardware that I have here.
While I still had 8.5.0 installed, I also tried creating a new VM, from an OSX installer app bundle (10.11.6). This went through the motions of setting up a VM, options and all, but when I click the run button, again the "Internal Error".
Searching for help on this leads to lots of reports of 8.5.0 crashing on Sierra, and lots of old (some very old) reports of the "Internal Error" and what was done in those cases to solve it. It is not 3D Acceleration. That is already turned off on all of my VM's.
Does anyone have any suggestions as to what I might try beyond what I have done already? There don't seem to be enough reports of just a general failure of Fusion to run on Sierra to indicate it is widespread, but it is happening to me on two different machines (different in many ways, hardware-wise). Thanks for any suggestions.
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henry