quitting an application

After recompiling my application using LW 6.1 (upgrading from LW 6.0) on MacOS 10.6, an error often (but not always) get printed in the terminal when I quit the application.

Error: No applicable methods for #<STANDARD-GENERIC-FUNCTION CAPI-LIBRARY:DISPLAY-MESSAGE-ON-SCREEN-REPRESENTATION 205B0F0A> with args ("No applicable methods for #<STANDARD-GENERIC-FUNCTION SCREEN-INTERFACES 206FE24A> with args (NIL)" NIL :CONTINUATION NIL)
  1 (continue) Call #<STANDARD-GENERIC-FUNCTION CAPI-LIBRARY:DISPLAY-MESSAGE-ON-SCREEN-REPRESENTATION 205B0F0A> again
  2 Call #<STANDARD-GENERIC-FUNCTION SCREEN-INTERFACES 206FE24A> again
  3 (abort) Quit process.

Type :b for backtrace or :c <option number> to proceed.
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CL-USER 1 : 1 > 
Warning: Capturing attempt to throw out of _CAPIGlobalMailboxHandler:.read failed 0 0 copy stdoutlogout

Has anyone had a similar experience or perhaps have an idea why screen-interfaces is being called.

Any suggestions would be welcome.

Thanks.
Paul