I'm by no means a pro, but it looks like from one line in particular, Diablo is crashing first, which closes Demonbuddy automatically.
This line right here:
13:15:16.641 INFO ZetaDia Diablo III Exited, Demonbuddy terminating in 20 seconds.
For my issue (on another thread), my problem was Diablo. The files had become corrupted, so I had to do a fresh install of Diablo, DB, everything. Just a thought, but Tony probably can see something I'm not seeing and point you in another direction before you have to take that step to a fresh install of Diablo.
If you do end up reinstalling Diablo, I would recommend changing the default install path to a shorter one line C:\Diablo III or just C:\ (and then it will make its own folder). You can change it through the launcher before you hit "Install" and it seems my bot is running 10x smoother since I did that.
Just my 2 copper though.
*moseys on down the road*
I'm still pretty new at DB myself, keep it mind, but it *looks* like a Diablo problem.