i’ve find a dirt way that help a little.
Since is work with VRAY RT Active shade and not with VRAY RT production renderer, i think tha’s a bug on the Production one.
If i’m using the Make vray rt animation preview modified by Subburb , it’s work, because it’s using VrayRT active shade instead of Vray RT production .
But i can’t use Backburner and others features of the production renderer .
for helping people wich search how to render animated deformed object with modifiers, morphers or point cache, here is the post where you find the modified script from Jerome .
VRAY RT GPU is really a good production renderer , it’s sad that something seems missing to make it able to render what the active shade one is able to render …