Not a huge deal to me as I don't play Dgen anyway, but I noticed that for me at least, with my BAT install (4.12 base), that DCG seems to want to hang on! LOL. I uncheck "replace career generator (Dgen)" - and everything looks fine. However, if I close off DCG then restart it again, I see it back checked again. 

idk, it might be local to me, but I think I found the issue. When I attempted to do a manual restore (back-up and change dgen.bak.bak to dgen.exe), I discovered that dgen was actually still running in my task list. I am thinking that that was why DCG was not able to correctly do the Dgen restoration on it's own (though I didn't see anything in the logs to indicate this) - but I think all is working okay now...seems okay.

If DCG (as DGen) doesn't shut down after generating a mission or debriefing (because it hangs on an error), it will remain running in the background until you kill it through Task Manager or reboot your computer.