I thought that I had posted this earlier today but I guess it did not make it through.
Got confirmation that the problem with the DI sonar (using Chart Speed 2 and Sharpness) was fixed in software version 7.460 but it somehow did not manage to get into the release notes. So all Si models running 7.460 or higher should not have this problem.
LOL They do seem to be getting their act together with the software development .... If they keep it up, they will have me in their camp for the rest of my fishing days.