Builds as reflected on changes page under Build History

I have noticed a few times, including as I write this, that sometimes the
progress of a build seems to get stuck as shown at:

http://ci.netsurf-browser.org/jenkins/view/All/job/netsurf/changes

Today the progress is still stuck from Jan 15, 2016 7:37 on #3269 at, say,
95% completion, and a build #3270 remains "pending".

RISC OS #3269 has downloaded fine, but presumably something has stuck at a
later point for another OS.

Why/how does this happen?

Also, sometimes there is nothing listed under Changes for versions - not
even a build reference.

Just curious!

John

--
| John Williams
| johnrw@ukgateway.net

I think, therefore I am unsure - I think! *