ON occasion, the Ghosting of units still occurs....not sure what the trigger is for that one.
All I know, is when you undo the log on occasion, some units cease to exist.
I'm not sure HOW the code stores the Undo "memory". If that hasn't changed at all. It might be something else.
All I know at this point is running through logfiles...then backing up will eventually blow the file. And stepping forward is completely incomprehensible to the action. Some units will be missing. This MIGHT be also associated with the ghosting effect...NO clue to that.