tonight, i installed win2kl sp2.
so far, no serious problems except one.
the behavior of the midi plugin in ie 5.5 changed.
before the upgrade, i got a full media player window
(like when doubleclicking on a midi file)
now i only get a very small control.
and the behavior changed.
before the upgrade:
i clicked a link with a midi file,
the file was downloaded and started playing.
clicking on another midi file link while the first one
is still playing downloads the second file and starts playing without any forther action from my side.

after the upgrade,
when i click the second file,
it is downloaded,
but then i get a message that
the specified midi device is alreay in use.
so i have to close the first file manually,
only then can i start the second file.
this is inconvenient.