Add the net render checkbox back in the gui.
It won't break anything by doing so, since you can keep the current functionality in the drop down menu, but it will help people when this frustrating bug is happening, that the Flag is set to "rendUseNet=TRUE" somehow without the users knowledge. It happened to me from time to time, and I guess it must be as frustrating for others as it is for me if this occurs. Sometimes I feel like I spend more time on troubleshooting than on the creative side!
This should be pretty low hanging fruit for the devs if you want to cross off an implemented idea from the list! 😉