I am experiencing this problem too, even with Googles Chrome packages
for Ubuntu. This worked on release of Ubuntu 13.04 but an update in the
following days broke it. I don't know which update, however.
I have noticed that if you let gnome-keyring-daemon run for 20 minutes
the CPU usage eventually
Also the fact that this bug is two years old means the time span for
patience has long been left standing in the dust...
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https://bugs.launchpad.net/bugs/736743
Title:
environment block
For me this happened when I installed a program, then immediately
decided that I don't want it and hit the Remove button that shows up
(while it was still installing) it then removed the Remove button or
grayed it out, not sure anymore - and after the progress bar on the item
was gone the installer