In kde-base/plasma-workspace-4.10.2, the KDE plasma workspace, panel and notification area crash frequently for several users - see the bug report on KDE https://bugs.kde.org/show_bug.cgi?id=311871 Please restore plasma-workspace-4.10.1 to the portage tree so that I can downgrade, thank you!
The bug dates back to 4.9.98, so even 4.10.0 was affected. Restoring 4.10.1 would not help - 4.9.5 would help, indeed...
Well, 4.10.1 did not crash for me and the bug reports my computer generates with 4.10.2 are extremely similar of the ones in the KDE bug report. So I believe that the Gentoo version of 4.10.1 was not suffering from this bug.
I am sorry, but we decided in the gentoo kde team meeting to not restore the old version.