Spontaneous Terminal Opening

We have the following problem with deployed (tty) server images.
Sometimes, when an error occurs in either the startup process or 
another process,
and that error is not handled, LispWorks will try to open the (tty) 
debugger.
That is OK. However, output of *terminal-io* is redirected to some log 
file,
and there in no (functional) input to *terminal-io*.

What happens is that LispWorks spontaneously opens a terminal window 
that
only functions as input (output still redirects to the log file). This 
sometimes also happens in the IDE.

On a developer machine that behavior is more or less acceptable,
however on a (headless) server this gives a problem along the lines of 
'cannot connect to window server'.

Is there a way to control this behavior ?

TIA,

Sven

PS: versions are LWM 4.3.7 on Mac OS X (Server) 10.3.6