Well, switching between perspective/orthographic view can be done without any problems via the View menu in 3.3 as well.
Standard views: You need to enable Snap (most left button in the Hotbox). That done, as you navigate/rotate the scene the cam snaps to a standard view as soon as you come near to it (Note that enabling Free, the second icon in the Hotbox, overrides Snap). Maybe this needs some training, but it's still my preferred way to set a standard view...
Another way to get specific views and store certain views is to use mmApi (know it's a bit complicated to set it up....). In pre-ViewCube times I wrote a script to do this, but as soon as you navigate in MM again, the cam snaps back to its previous position. If you're interested I'll post it. In my MM Tool Manager V3 (message 35) this storing of views is implemented as well.
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Downgrading isn't that big deal. All personal stuff you did (parts, stamps, shaders, printers...) should stay (but to be sure make a backup of the meshmixer folder in your documents). So I'd give it a try... but looking at your advanced GPU I guess it's another problem...
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Another thing you could try (assuming MM is down - as it crashed):
There are different issues if no printer is set. So check meshmixer.ini
That file is located at:
Windows: C:\Users\User Name\AppData\Roaming\Autodesk\meshmixer.ini
(NOTE: AppData is hidden by default, so you might have to enter that path manually or choose to show hidden files.)
Mac: ~/.config/Autodesk/meshmixer.ini
(NOTE: .config is hidden by default, so you might have to enter that path manually or choose to show hidden files.)
Open it in some text editor and search for the line starting with "SelectedPrinterUUID".
If it doesn't exist add this line in the [Options] section:
SelectedPrinterUUID=34043662-242b-4c92-8af7-a38ee78fd995
Or if there's no such ID set put in the ID after "="
(This is the Autodesk Ember - just to set one...)
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If this still fails another try:
set:
EnableBasicRenderingV3=false
to
EnableBasicRenderingV3=true
This is a worst case solution but interesting to know if that works.
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I'm so sorry if all this trial and error. But it seems technical support for MM is limited 
