When clicking the caps-lock button of gkrellm-leds, gkrellm crashes with
the following message:

The program 'gkrellm' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadValue (integer parameter out of range for operation)'.
  (Details: serial 2218 error_code 2 request_code 145 minor_code 2)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)


I have remapped the caps-lock key to the compose-key in xorg by setting the
following option in the "InputDevice" section of xorg.conf:

        Option      "XkbOptions"    "compose:caps"


Maybe it has something to do with that.

Regards
Marco