Hi Fabio,
I have started working today and i could not work in even C10. Same problem. Now its happening continuously. Its strange C10 was working fine yesterday , today both C10 & 10.5 have issues. This is the same original problem that used to happen just after 10.5 release and fixed in very first update. I did provide my sample project to Steinberg support to fix this issue. If this is not that problem then symptoms are same. In any case, i cannot work on Cubase. I have attached clip here.
Thanks,
Jay