@AndrueD: Many thanks for your suggestions.
Have not tried to disable sound, because it would not be an acceptable solution.
My key concern and interest is why there are only two mods (so far) out of the many I have already played on this configuration that are causing problems on the Save?
I would be very interested to know whether this issues has been encountered by other people using the same mods. Particularly with Ronin, Kensai of Kyoto, which generates the problem very early in the mod.
If other people are not experiencing the same issues when playing these mods, then I would really like to understand what I may have done that is causing these issues. The fact that Proleric had the same issue when he tried to save the game I uploaded, indicates that the save is already corrupted.
So the real question is why are the game saves getting corrupted at some point during play, how can I determine what is causing this and, most importantly, how can I avoid getting the problem?