Anybody noticed that after a certain amount of unheld items are on-screen, they start to become part of terrain or just become uninteractive (no emitters can be created on it, no MO-MO interactions)?
I've finally found a solution.
It would appear that in the new version, this has a limit to decrease lag... However, if you prefer to have more lag, but more MO interactions, go into Settings.ini and increase MaxUnheldItems, that should do it...

Also, raise the RestThreshold, and make the objects out of a material with high priority.

Yeah, that keeps them from becoming terrain, but for instance, try this.
Get my mod, Deathspray, and spray some around.
Eventually, after having sprayed enough, the little balls that come out and the magazines dropped with not become terrain, but will also not be able to come in contact with other objects, as if their GetsHitByMOS and HitsMOS is off.
Raising this variable makes the cap for that higher.

viewtopic.php?p=132584#p132584
Thats all I can say.