PDQ Deploy thinks PDQ Inventory isn't installed
I'm running Enterprise of both Deploy and Inventory and when I try and "Link To" from with a Deploy Package Schedule, the option for "PDQ Inventory Collection" is greyed out and hovering over it shows a popup that says "PDQ Inventory is required to use PDQ Inventory Collections.
Oddly, I have quite a few existing packages linked this way and when I view them, the link is there are appears to be active.
I've restarted services and the server with no luck.
Anyone have any ideas?