I am using Kubuntu 10.4 and have recently developed three problems :

1. When I minimise something that is running, instead of shrinking to an icon in the
bottom panel they go right through and disappear off the bottom of the screen. Yet they
are apparently still active because if I reopen from the desktop icon I get back to where
I was.

2. Kppp - my internet access - used to shrink to an icon in the panel and show the
time elapsed on line, but now shrinks to half an icon (the top half) with two sometimes
flashing small green rectangles underneath. I do have both the 'dock' and 'show clock'
options ticked and have tried heightening the panel itself to make sure there is room

3. Dolphin - the file manager - if I left click on a file name then it opens in Kmail.
Or rather Kmail opens with the file offered as an attachment - which is of little use. If I
right click on the file name in Dolphin then I get a choice of opening in Kmail, Kate or Writer. I
would like to remove at least Kmail from that list and make Kate the default option, but
how to do so? The only bit I can find in configurations is an entry :
[Open-with settings]
Completion Mode = 5
History = kate -b%U

My thanks to anyone who could help with these.