Sometimes, when the notification for an incoming chat message appears, clicking the 'Respond' button on it fails to open the chat window. This happens randomly. Reproducible: Sometimes Steps to Reproduce: 1. Chat for some time through an open chat window. 2. Get an incoming chat message so that a notification appears with a 'Respond' button. 3. If the chat window was open, the focus may not change to it. If the chat window was closed, it may not open. Actual Results: The chat window does not open or get focus after clicking the 'Respond' button. Expected Results: The chat window should open if closed or get focus if open, after clicking the 'Respond' button.
This is actually a bug in Plasma desktop. Should be fixed in KDE 4.10. *** This bug has been marked as a duplicate of bug 303476 ***