See the following thread in the ObjectARX newsgroup:
"Problem in setting Alignment of Block Attibutes through RealDWG
application"
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wrote in message news:6139784@discussion.autodesk.com...
Note: the problem I have is quite similar to this:
http://discussion.autodesk.com/forums/message.jspa?messageID=6088743 Visible
text attributes changed in a block reference do not show the correct
justification. Regardless of what they are set to the justification ends up
being "Left". The blocks were imported into a master drawing using RealDWG.
If the output is a DXF then there are no apparent justification problems. If
the block reference's attributes are then modified/updated from a copy of
AutoCAD the justification will refresh correctly.