[Bug 1173521] Re: plasma-desktop burning 90-100% of a cpu (after update to raring)

[TerryHeidelberg]

1. I removed the old lock file; no effect

2. I incrementally removed all icons on the desktop; no effect

3. I removed most, but not all, icons (widgets? I'm not sure about the terminology here)
that are embedded in the menu-bar (which I keep at the bottom of the screen) ; no effect

4. I did notice an effect when I clicked on the plasma icon (Panel Tool Box widget?) at the
lower-right-hand corner;   when the additional panel-settings window was hovering above
the menu-bar (panel), the plasma-desktop cpu dropped from about 90% to about 70%,
and stayed there;   when I exited the Panel Tool Box panel-settings window, the cpu
percentage of the p-d process went back up to about 90%.

Each time I restart plasma-desktop, I get quite a few error messages from X and  some
from plasma-desktop.    Here's one that caught my eye:

plasma-desktop(23604)/libplasma Plasma::isPluginVersionCompatible:
unversioned plugin detected, may result in instability

I have no idea what is happening with this msg.

In case those messages are relevant, for context, I'll attach a file that contains one such series 
of messages in response to a p-d restart.

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Title:
  plasma-desktop burning 90-100% of a cpu (after update to raring)

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