i have a vdb sequence in the scene aswell as in the sequencer.
seems i need to have one in the sequence to be able to render it.
i often get random crashes relate to vram while rendering, although i have allocate 32gb for out of core usage.
since i can set the frame range to start from where the crash occurred its not an issue.
however, the vdb i have in sequencer after the new start gets greyed out and the material settings i had in place are lost, ie they defer to the default settings.
i am kicking myself not to have made a screenshots of settings, this way i cant really pinpoint the exact same settings and the crash happend mid vdb.