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this is the age old problem of true type v's shx fonts, Calibri seems to work well during translation but is by no means perfect
http://forums.autodesk.com/t5/Inventor-General/Calibri-font/m-p/3944840/highlight/true#M472593
Any particular reason why you are exporting to AutoCAD? Why dont you save your .idw to .dwg and you can open it in AutoCAD without any issues
Hmmmmm thats very silly.
Ok so how about saving the .idw to a .dwg, copy the drawing, make the Layout a block (Create Block command) and insert it into model space and explode the block?