From the VAT 2.1 release notes “Shader logic has been changed for rigid exports that ensure better precision during playback. This does have an undesirable impact on the start frame because of precision issues with vertex colours being used for the centroids.” Does this imply legacy textures are not compatible and we should re-record and export to use with new Vat 2.1 Material?

(Legacy being pos and rotation textures exported with earlier versions of VAT)