I have 14 wus in "project backoff" state in the upload results stage. I've never seen this before. These are all long-runs that take about 6 hours to complete.

boinc 7.0.28
Win7 X64
only gpugrid tasks running on a computer dedicated to gpugrid.
A few of the wus show a small amount of upload progress..from .02% to .14%.

An example reads:
Upload: retry in 00:00.44 (project backoff: 00:08:30)
The "project backoff" time is identical for all 14 wus but the "retry in" varies widely all the way up to 05:25:30

I've tried "Retry now" several times on all of the wus to no avail.
I suspended gpugrid and rebooted the computer.
New wus continue to download and run.
Internet connectivity is good.

Guidance?

A message on my system from the server says it is out of disk space! I too have had some problems uploading. John