message display threading issues

[Jack <ostroffjh sbcglobal net>]

Good morning all,

I've posted before about threading issues (threaded display of  
messages, not compiling with/without threads) but I've noticed  
something much more frequently since upgrading to 2.5.1 with gtk3.   
Unfortunately, I have not been able to figure out any pattern.  When I  
open a mailbox, sometimes the contents appear threaded, and sometimes  
not.  In the past, when this happened, just clicking on a column  
heading (twice, to end up in the same order I started) and it  
threads/indents correctly.  Now, it seems completely random, and  
clicking on any headers any amount of times only seems to cause a  
threaded display maybe 1 quarter of the time.  Closing and reopening  
balsa works a bit more consistently, but still not always.

My preferences are set to date for default sort column, JWZ for  
threading style, and expand threads on open IS checked.  One question -  
the preferences says "default threading style".  I know clicking on a  
column head can temporarily change the sort column and order, but is  
there something to temporarily change the threading style?

Thanks for any suggestions.

Jack