knotify4 loads 60% CPU

I just noticed today this: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 14364 gene 20 0 1726m 263m 11m R 69.9 2.2 322:25.51 knotify4 (i) its taking up 263 M of mem (1.7 virtual) - really? for what? (ii) its holding the CPU at 65-75% ... anyone else seeing this - known bug? Running on F15 (stock kde - have not yet updated to 4.7). /var/log/messages has nothing of note .. gene