PLAY disappears from VST Instruments List

Hi, all
I open PLAY in the VST Instrument List, and open Instruments within the player, such as Ministry of Rock. But when I close the Cubase Project and re-open it, PLAY disappears from the Devices/VST Instruments List.

I get a pop-up: “Missing Ports”
Missing Ports: PLAY VST
I/O: Out
Mapped Ports: Unmapped

PLAY VST is activated in the VST plug-in information list, under:
C:\Program Files\Common Files\Steinberg\VST2
AND… the play_VST.dll icon is inside that folder.

I have other VSTs in the same place, such as Trilogy, and they work fine.
Any suggestions? Thanks!