Hello Claudio,
If you are able, send me some pictures of the graphical issues you are seeing in Spike. You can email me at aj@signalhound.com. I will see if there is anything I can do to help. Also, if you have any pictures or descriptions of the zero-span issues you are having at 1MHz, include those too. I look forward to your email.
I am glad you were able to get HDSDR working.
Regards,
A.J.