This problem you see is not related to cairo-clock, but the xserver and
compiz. What you are seeing is client (compiz) and server (well the
xserver) disagreeing about the OpenGL texture-target to use for drawing
the redirected window (the one of cairo-clock). One of them wants a
power-of-two texture-target the other one a non-power-of-two texture-
target and in the end the user just sees a white rectangle. This issue
in the xserver if fixed upstream. For the related bug-entry in the
xserver see...

  https://bugs.freedesktop.org/show_bug.cgi?id=11109

Until xserver 1.4 hits the Ubuntu repositories just make sure you use
cairo-clock with non-power-of-two width/height to avoid this "white
rectangle"-thing. Do achieve this you can do two things...

1.) Start cairo-clock from the command-line like...

    cairo-clock --width 200 --height 200 (and any other options you
like)

Just don't use any power-of-two value for width and height (e.g. 64,
128, 256 etc.).

2.) Or while having started cairo-clock form the applications-menu,
right-click on the "white rectangle"-window and select "Properties".
Change the width and height via the appearing dialog.

** Changed in: cairo-clock (Ubuntu)
     Assignee: (unassigned) => Mirco Müller
       Status: New => Invalid

-- 
no clock, just a white square
https://bugs.launchpad.net/bugs/132449
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