🚀 go-pugleaf

They say: "If you post something and you get no answer, try once again
sometime later".  So, here's my problem once again:

=====================================================================

When I use the "list" environment together with "twocolumn.sty" I get
strange underfulls like:

 (i) Bla bla bla bla bla bla bla bla bla bla 
     bla bla bla bla bla bla bla bla bla bla 
     bla bla bla bla bla bla bla bla bla bla.

(ii) Bla bla bla bla bla bla bla bla bla bla 
     bla                                 bla   <----------  !!!!!!!
     bla bla bla bla bla bla bla bla bla bla. 

The same happens if, instead of "twocolumn.sty", I switch to 
"multicolumn.sty" and I select 2 column output as

 \begin{multicols}{2}
 \begin{list}
  .......
 \end{list}
 \end{multicols}

Of course, I get the error message "Underfull 10000", but I have no
idea why this happens.  If I join the two "bla"s of the line with
underful by a tilde (~), then an underfull occurs as

  bla bla                    bla 

Keeping using the tilde, eventually pushes the underful to the next
line, but it seems I can not eliminate it completely.

Any ideas why this happens????

Thanks in advance, and, please, forgive my TeX-nical ignorance :-)!

Dimitrios

PS.  The underfulls do not appear when I abandon 2-column text and I
switch to single column text with text-width equal to column-width of 
double column text!!!!