Considering that AutoCAD 2008 didn't natively support SID files (needed the raster design object enabler to see them), I wasn't surprised when I had the same problem with my plans. I've used Irfanview to convert the SID file to TIF and that was the only way to see them in Impression. Unless they make an object enabler that is compatible with Impression or add native support for SID files, you're probably out of luck except for converting the images.
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