> Fairly regularly, and for different sites, I see a 
message such as this:
>          Warning: Warning, link #20 empty
> in the log file.
> I tried to trace the code, but was not successful at 
tracking
> what was going on. Is there some way to get the 
source address/file which
> contains this 'empty link'?
Yes, I encountered this message, and thought it was 
due to the anticipating system. I suspect the engine 
to 'jump' to link N+1, but I don't exactly know yet 
what's going on.. I'll try to trace this