not nescessarily a bug, but I was running numina the other night and the part where you need to hunt Vahzilok in Faultline caused us a bit of a problem. Obviously, a group of 8 lvl 35+ should have little problem dispatching 20 vahzilok, but its hard to do when you cant find them.
The issue is that they only come out at night. Our team got there right at dawn, and then had to wait for a good 10-20 minutes for them to come back out again. During this time Several TF members got impatient, and one ended up leaving because it was taking too long.
My suggestion to alleviate this inconvenience would be to have some vahzilok appear around the Skyway gate area during the day, just to keep the Task force running if other teams find themselves in the situation we were in.