Valhalla Room settings not remembered in Vegas Pro 15

[V'ger]

All other VSTs will keep settings, but not Valhalla Room. Upon project load, and even within a session, all settings just revert to default, even if another preset has been loaded (but happens if Default preset has been edited too).

No Room preset has been saved or loaded in Vegas with the project, it happens even with a blank project.

Any ideas?

Windows 7 64 bit, VST 32. Room 1.5.1