Vizio M55 series with a dell zeno htpc. Unsure of firmware.
3d mode was not an option on the tv. Input display on the tv was showing 1920x1080. I checked the computer display output and it was pushing 60hz. Dropped that down to 24hz and the tv showed new input resolution of 1080p. 3d was then enabled.
I think the issue is that the Vizio only can display 3d at a sub 30hz rate, so your computer needs to let the tv know its pushing out something in that range. Any driver issues might just be related to the scaling down off the default computer refresh rate, which will be 60hz. (Or something)