[Orgmode] byte-code: Key sequence contains invalid event

[Alexandre Billon]

Dear list members, 
I updated my org-mode files a month ago and since then, I get the following error message

"byte-code: Key sequence contains invalid event "

 when I

1. Try to export files to other formats (LaTex and html) 
2. Try to use org-remember
3. create a new .org file

This makes 1 and 2 unsuccessful. Can anyone help? 

I am currently using org-mode 6-36c on Mac-OS X either with Acquamacs 2 or with Emacs 23.2.  

Best regards,

Alexandre