KMail is a real mess after upgrading to KDE 4.2

Hi, people

I've just upgraded KDE to 4.2 from updates-testing and generally 
speaking, I liked the upgrade. There were some minor problems, but all 
in all it's good.
Kmail, however, is a real mess. The message list panel is completely 
broken. The columns I had selected to be shown there and their order 
were lost and all the 17 columns that can be selected to be shown were 
checked, including two columns for the sender of for the recipient 
depending on the selected folder, because the sender/recipient, sender 
and recipent columns were all checked. But the problem is worst, because 
after reconfiguring all this, I see that every time I close Kmail and 
reopen it, all message list panel configuration is lost and all the 17 
columns are shown again.
Also, the columns which have just icons in their contents, like the 
spam/not spam, attachments, important and others, now have texts on 
their headers. Theses columns are normally set to be just as wide as 
necessary to the icons to be shown. With texts in their captions, only 
the first letter of the header appears. This is a regression, because 
until kde 4.1.4 kmail used icons on the headers of these columns.
Also, kmail does not honor font configurations for the message list 
panel anymore. The configuration screen is there, but has no effect at 
all.
Worst than all this is the fact that kmail does not group messages in 
threads anymore. And the option to set this up is gone from the Folder 
menu. I hope this is well hidden somewhere else, but I couldn't find 
it... Does any one know how to setup kmail to thread messages now? 
Really, a mail client that does not thread discussions is of no use for 
me.

Is there a way to go back to the previous version of KMail??

Thanks,

Marcelo

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