It’s not a secret
That MAP 3D and therefore Civil 3D can run into display issues working with FDO data; this is data you attach, not data you import – data you import is an entirely different story
You attach data, adjust transparency, plot, and see a black mass. This may be because the MAPPLOTTRANSPARENCY variable is turned off. To turn it on type MAPPLOTTRANSPARENCY and turn it on.
In some cases, the transparency still won’t show, that could be due to your plot settings.
In any case, a service pack was released a short time ago, but the service pack has created another issue in some cases. When you switch to a 3D view, certain FDO based Display Manager layers may fail to display, but this apparently only occurs if you have AutoCAD Map 3D 2009 Update 1 installed. To resolve the issue, visit the page where the hotfix is posted.
Cheers!
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Glad to see you’re still alive and well! That system variable is HUGE. If you don’t know about it you’ll pull your hair out trying to plot your FDO maps. Thanks for the post and we’ll all see you at AU!