New odd behavior - selected message not within dislay and others.

[Jack <ostroffjh users sourceforge net>]

I wonder if Balsa is also suffering from the virus pandemic.  Over the  
past weeks or months, I've noticed a set of new odd behaviors.  Of  
course, they occur inconsistently, so either I'm imagining something,  
or perhaps it's a Heisenbug.

Normally, when I've read all new messages in the current mailbox, and  
click "Next Unread" Balsa switches to the mailbox with the next unread  
message, selects that message and displays it, and scrolls the message  
list to show the new message line.  The first part does always happen -  
display the next mailbox with an unread message.  However, sometimes,  
the message selected is an old one (or perhaps the one with the highest  
message number, which is essentially random for maildir mailboxes.   
That has happened infrequently, but for a long time.  It now seems more  
frequent.  What is new, however, is that the selected message is NOT  
scrolled to the center of the display, and may be very far away.  What  
seems mostly the case when this happens is that the new message is  
actually selected, but the message list shows somewhere near the top of  
the list, with the new messages at the bottom.  I can either scroll  
down, or if I just hit the down arrow, the list scolls to the correct  
position.  The final, least common bit, is that I do NOT see any  
scrollbar on the message list.  It is always there if I switch to  
another mailbox and then back.  It someimes seems to appear, if i don't  
pay any attention and just start reading the new messages, and look up  
later to see it's back.

This is with a version compiled from the index_row_height_workaround   
branch, but I'm pretty sure I saw these issues in master before that.   
I'll recompile from master shortly to see if it's still present.

Any (strange?) thoughts?

Jack