Another point to mention in SatPC32 is to set up is to make sure that you have the correct time offset. In the settings observer dialogue you either need to manually set your offset or use the "auto" setting to properly track DST/non-DST time. Else manually set it to minus whatever your offset is for non-DST and one hour or less for DST. The "Half an orbit off" issue probably is as much related to this setting as anything. I normally set the offset manually then have to remember the next time I open after the DES P change to fix it again.

Tom N5HYP