@siarkowski I believe I have found the cause of this.
A while back, right after the version you reverted too, we added an improved queueing system which is working perfectly in 1.6. However when we ported it backwards into 1.5.10.x I made a simple syntax error (the wrong $task->id vs $task->get('id') ). I have fixed this in the latest dev-branch.

This should also greatly improve the experience of the imaging task queue (see also https://github.com/FOGProject/fogproject/issues/736 and https://github.com/FOGProject/fogproject/issues/691) I thought I also wrote a post somewhere in the forum walking through the updated process that fixed some longstanding date math issues, but I can’t find that now.

Point being, if you would be so kind as to update to the latest dev-branch version and see if it fixes the issue, that would be very helpful.