Re: 188.16 - Memory leak and gaphical "corruption"
I've had plasma bleed sometimes in the past but not recently really - try the kde 4.2 beta if you can as it seemed to work fairly well with the 180 series of drivers with the exception of unexplained (but probably slower) xorg leaks.
But before that, you mentioned restarting kde gets you no where. So if you do
Does the memory get free'd under xrestop? Does the plasma entry at least go away? If it doesn't restart automatically.
in the terminal afterwords.
I was able to get back my memory from plasma when I restarted it although it was a slow and annoying process. But at least its not a full desktop restart. Additionally, since the client memory is tracked from xorg it should free it when plasma dies.