By far, is all the cases i've had in such cases, this remedy works great :
In settings>queuing, set the max downlaods per user to 1
Some people (Esp. those with many videos in their shares) tend to treat any person queuing up for more than one file as a queue hogger and consequenttly earn a place in the ignore list.
After doing what I said, then make a minor change in your name and then try to download from him again.
Cheers