volume control buggy in 4.10.2

kmix is very buggy after updating to 4.10.2. There's a lot of lag in touching the volume up/down controls, and after fiddling a few times, now the plasma is stuck on the screen, and kmix is completely unresponsive. This is repeatable. Don't know if these .xsession-errors are related: void DBusMenuImporter::slotMenuAboutToShow(): Application did not answer to AboutToShow() before timeout void DBusMenuImporter::slotMenuAboutToShow(): Application did not answer to AboutToShow() before timeout void DBusMenuImporter::slotAboutToShowDBusCallFinished(QDBusPendingCallWatcher*): Call to AboutToShow() failed: "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken." void DBusMenuImporter::slotAboutToShowDBusCallFinished(QDBusPendingCallWatcher*): Call to AboutToShow() failed: "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken."