1)I noticed this since little time, it may be due new graphic drivers? or some changes in the Octane plugin( what is your version?), i dont know yet, I have to investigate ...
2)I think its not possible easily in this state, and this is good idea for next time
3) its difficult to deal ideally with c4d viewer... i will take a look.
thanks and sorry for those little troubles
Ps/ if you want you can send me the scene via PM , so that I look if all is well?