Hi, Trashmob, and THANK you for all those logs!
This appears to be a navigation issue specific to the last boss of Gundrak. Tony has opened bug report HB-1820 against the issue.
For now, please either be prepared to manually loot the last boss, and reschedule Dungeonbuddy each time. Alternatively, find a dungeon other than Gundrak to run.
cheers,
chinajade