[Alan <hallat@xxxxxxxxx>]

The answer to this is probably lurking in the list archive but I can't 
find it :-(

The cinfo element of the packet_info structure appears to be getting set 
to null after initial col_add_str to COL_INFO calls.  I can't do any 
further col_append_str as check_col always returns false.  *IS* this 
because pinfo->cinfo is nulled or is there something more to it?

I must add this is my first attempt at writing a dissector, I gather the 
dissector will be called multiple times/multiple passes? It would appear 
that everything is ok on the first pass as the initial string put into  
the info column does get set it's adding to it subsequently that is the 
problem..

TIA
Alan
only slightly confused :-)