Some presets not working - revolver

Greetings all,
I just got Revolver convolution verb (see specs for it and my computer below). I have this odd problem where all the presets appear in the plugin, but only about half of them actually work.
So for instance I can select “IR_Church_Buikslotokerk” and all the settings will change, but when I select “IR_DP4_Summer_Hall” the name preset name is displayed up top but the settings don’t change.
So far, all of my own saved presets work fine.
Any ideas would be welcome :slight_smile:

Cubase Pro 11.02
McDSP Revolver 6.8.7
iMac, late 2013, Catalina 10.15.7
24GB ram, 3.5 quad-core intel core i7