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Si This just in from Beat...
I suspect Maurice hit grid-fit and/or pixels. Both switch from font units (design coordinates, the typical 2048 x 2048 em-square) to device units (number of pixels at a given ppem size, in fractions of 1/64). The latter are a function of the rasterizer, which I can't run "back-to-front" to calculate the font units from the device units (or if so, only with undesirable loss of accuracy, which I'm sure will not be appreciated). Therefore, while in grid-fit and/or pixels mode, VTT won't allow to edit the outlines.
Cheers, Si