i'm running debian edge. I installed the nvidia drivers, installed all beryl packages and changed my xorg.conf. Beryl-manager is running but i can't get the effects running. Looking glass is running fine.

When you right click your Beryl icon in the taskbar, make sure you have Beryl as your Window Manager. It's possible to run Beryl while still using KDE or something else and therefore no effects.

hmm, indeed, when i right click on de berylicon and choose beryl as a windowmanager the screen flashes a few times and then goes back to metacity(gnome). so something goes wrong there, isn't there a error log file where i can find more info...

Not really sure. You'll have to search around for some more help.

Does the beryl splash screen show up?

How do you start it? Through script at start-up or just terminal once gnome is running?

hm no splashscreen, only the borders of the windows are drawn again(without decoration)
i have put beryl-manager in the list of startup programs via Preferences->sessions

sounds like direct rendering is off
to verify.
if it's running, you may want to check the options concerning the method of rendering. (right click on the diamond) play around with it, i had exactly the same probs as you do and after installing the right driver and fixing my xorg.conf that was the final step to get it going.

rendering is running, i tried different configuration options, none worked so far
however, when i execute beryl-xgl i get an error
beryl-xgl
**************************************************************
* Beryl system compatiblity check *
**************************************************************

Detected xserver : NVIDIA

Checking Display :0.0 ...

Checking for XComposite extension : failed

No composite extension
134592117 screens detected.
Currently we cannot guarantee that Beryl will work correctly with multiple X screens.
Using the --no-context-share command line option can help.
Please report any success to the beryl developer mailing list. The list can be found at lists.beryl-project.org


So, i have to find out what that means..

you need to add some things to your xorg.conf file:
add the section -
Section "Extensions"
Option "Composite" "Enable"
EndSection

And run these commands -
su
nvidia-xconfig --allow-glx-with-composite
nvidia-xconfig --render-accel
nvidia-xconfig --add-argb-glx-visuals

Wow - that seems a bit weird...

cybertaz's solution should work for you (it will get composite working, which Beryl needs). Hopefully it will fix that "screens detected" error too... That is is a weird one though, I've never seen that many screens detected before.

I used to run beryl on my suse 10.1 machine with no problems, but now that I have upgraded to suse 10.2 I get an error identical to the one above (including the number of screens detected). I am using the latest nvidia drivers and beryl realease. Composite is enabled in xorg.conf. I have tried almost everything but nothing seems to work. Any help would be gladly appreciated

problem was probably my xorg.conf, unfortunately some script broke my x-server. so i switched to fedora7, beryl runs very smoothly now

I managed to fix my problem in Suse, I just turned off shadows and translucency in kde and restarted beryl and all worked fine :-)