RT upgrade - transactions doubles


I’ve just upgraded from RT 3.0.9 to 3.4.2.
Moved db, run upgrade scripts.

All is ok except one thing: Any comment/reply from
a user who has SuperUser right doubles.
So after reply I got 2 transactions, one is blank
and just says “reply” and other is linked to
attachments and have proper message body.

All other users can reply and comment normally,
only one transaction produces.

Have someone conformed with such a problem?

Thanks in advance,
SY, Danial.

Danial Klimkin,
Falk eSolutions AG Russia.