Delta Keyer with Bluescreen doesn't work

As the title suggests, the Delta Keyer with Bluescreen doesn't work. Greenscreens are fine.
Same bug as reported in the Fusion forums 3 years ago viewtopic.php?f=22&t=81264
Spill suppression doesn't work properly with bluescreens as well...
Same bug as reported in the Fusion forums 3 years ago viewtopic.php?f=22&t=81264
Spill suppression doesn't work properly with bluescreens as well...