Thank you guys.
I never know what is the source of the file the clients send me and I'm aware of these red squares but I've never known how to deal with them.
The Rebuild command works sort of, as the red squares disappear, but a Planar surface is still a problem, see the attachment.

The PDF export procedure definitely does the trick, thanks a lot!

Hi Marky, was it a DXF file that they sent you?

- Michael

Hi Michael,

- yes, it was.
Please find attached.

But I'm not sure if it's only a CDR export to DXF issue, as often I use an Archicad export to DXF procedure and experience the same issue.
I know, that from Archicad v. 20 there is a direct file export to 3DM, but I own only v. 19 which doesn't have it yet.

Thanks,
Marek

Hi Marek, thanks for posting the file. That .dxf file will be imported ok with the next v4 beta, it has a fix for this problem.

- Michael

Hi Marky.
You can also use ai. Open a dxf with red dots, export it to ai, open or import ai.