I tried the 6590 card with version 1.0.3.0, but unfortunately, it crashed after a while.
I changed the search steps from 10000 to 50000 for a faster search at 19.2E. Even with this setting, the search took almost four hours. It is true that it worked ticked s2x. At least I was rewarded with a successful spectrum with a card I didn't really use with IQmonitor.
So it also works with cards that are not too friendly with specific parameters.
All attempts to save transponders failed. I don't know how to fix this.