xv driver problem

[Marcelo Magno T. Sales]

People,

Since I upgraded from Jaunty to Karmic, I have the following problem 
when playing videos with the xv driver:

If I run kaffeine, dragon player or smplayer (using the xv driver), they 
all show the progress bar as if the video was playing. I can hear the 
video, but no image is displayed. If I run smplayer using the "gl" 
driver, it works. The other two, as far as I know, can't be configured 
to use other drivers.

If I run these applications with desktop effects on, the area where the 
video should be displayed is shown as a transparent gray rectangle. With 
desktop effects off, it is a solid black rectangle.

If I run mplayer or xine directly, without embedding them in a frontend 
like the ones listed above, they work ok with the xv driver. Gnome 
Player runs fine too.

I have created a new user to test this and with this new account I can 
run all the above mentioned applications with the xv driver and the 
videos are displayed ok.

So, there is some problem with my regular user account's profile, but I 
have been unable to find out what configuration file(s) is causing this 
problem. There are too much customizations on this profile, so I would 
like to avoid recreating it from a fresh one, if possible. These 
problems didn't happen when I was using Jaunty. My video card is a 
nvidia 9600 GT and I'm running the proprietary drivers from ubuntu's 
repos. I've installed kubuntu-restricted-extras and have the medibuntu 
repository enabled.

Any idea on what may be causing this?

Thanks,

Marcelo