I have black ultra inverto LnbBlindscan works if your antenna system is entered correctly in the receiver. What frequencies are you trying to blindscan and what lnb are you using?
I just search itWhat information are you entering for the blindscan? Can you post a screenshot of what you are entering in the blindscan plugin?
I like black hole imageMake a backup of your current image, then try the Open BlackHole image and see if you get the same results.