Message that popped up when trying to buy FMY 
”Fidelity does not accept orders for illiquid securities. Please enter a limit price”.FMY is a CEF that plays in the mortgage market.  I tried to buy some additional shares today after previously having assigned it to a “basket.”   I eventually put the buy through,  but needed to set a “limit” price.  Normally that’s not much of an issue.  But having  to do so defeats the purpose of using (and paying for) a Fidelity “basket”, since you’re supposed to be able to buy / sell / rebalance the entire basket with 1-touch.  Hopefully, this is a temporary issue that 
may not affect future basket rebalancing.
-  How common is this “illiquid” designation?  
-  Does it adversely reflect on the manager / product? 
-  Is is based just on very recent trading, rather than a longer period? 
-  Or (as I  from some limited reading)  is it simply a warning that the security is thinly traded?
At just 1.5% of total portfolio (inside a basket of 10) , I can’t see where thin trading would make much difference. Thanks for any thoughts.            
 
                      
      
Comments
I haven't run into such situations a lot but I think Schwab did the same few years ago when I wanted to buy a tiny Canada-based CEF.
if there are criteria, vanguard brk does not disclose.
either trade will be denied or user directed to call vanguard.