I have found that if the Streamdeck software is started (even in Admin mode) before MSFS is started, the Stream Deck no works correctly , as it use to before SU7. (or maybe even SU6 )
Now I have to restart stream deck, once MSFS is up & running, for it to respond.
Not the end of the world, (or a total break of Illusion ! ), but an inconvenient pain in the tush.
Since I believe I started to have this issue prior to SU7, maybe it was a Stream Deck Software update that started to cause this a month or so ago ?