Hi,
I don't think you client can export it any different if they use AutoCAD, but I am not even 100% sure why this might be happening based on the pdf.
It will probably come down to the DWG Translator settings though. When you open/import/merge DWG files into ARCHICAD, you always have to choose a Translator. This Translator defines what to do with native AutoCAD elements (such as hatches and groups). If you open a translator, and set the "Translate AutoCAD Blocks as:" option to "2D Elements" in the "Open Options", that should probably give you what you are looking for.
If that doesn't help, please send me the DWG and the PLN you are working with (with the problematic results), and I will take a look at what might be the problem. You can send them to me in a private message.
Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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