Moin moin =)
Well, would be good to know, if there's any massage when the newgen crashes.
If you get a massage that newgen doesn't work anymore and need to be closed, you should do the following:
Deinstall NewGen from your computer, make sure you delete all data of it. Optional but recommend somehow, you remove Warcraft 3 too (just to make sure).
Then restart your computer and make sure no config. data are left of both of them.
Then install Warcraft 3 again and after the NewGen and see what happen. Also keep both up to date (Warcraft is now on 1.26 and NewGen is on .5d - also keep Jasshelper (0.A.2.B) up to date)