Re: Strange error caused by post-command-hook.

[martin rudalics]

> Oh, wait, after a close look, I wonder what this 'tooltip-hide' is...

You probably have `tooltip-mode' enabled.  If so you could try to
disable it and see whether the bug goes away?

> To wit: This is the *Mesasges* buffer after I added the
> following hook:

Just to double-check: Did you add it to `pre-command-hook' as ...

(add-hook 'pre-command-hook
          (lambda ()
            (when post-command-hook
              (message "... %s" post-command-hook) (sit-for 1))))

... because I fail to understand the following message ...
        
> ((lambda nil (when post-command-hook (message "... %s"
> post-command-hook))) tooltip-hide)

... which looks like the value of `pre-command-hook'.