I am getting the same thing.
I am trying to get the lastInsertId but the logger shows only until id 554 but I see that 1315 rows have been inserted.
I get no errors, it just hangs there.
I am using:
Version: 5.6.0
Build id: V5.6.0_20141024_1545
On windows 7 Pro 64 bit.
The job is just running on my machine for now.