Yes, I've been trying that myself. Further investigation has shown that is I set the scene manager to 'detail' (previously it was set to 'list') this seems to work. However, the files already effected by the problem will not re-open (the position they were last saved at being a view with complex shadows).
At present we think it could be a clash with other software. I am continuing with the project re-building from a previous model (I'll lose about 5 hours work) with these new settings & save, save, save!
In the mean time, if anyone has any other suggestions...