I am running C3D 2013 and having similar issues.
Opening a file, everything appears as it should, colors and all, then ACAD does some command that turns all the linework grey. Blocks and X-refs are still colored fine. Drawing new lines shows up correctly colored on the layers that are now grey, but the once grey remain so. Selecting and moving, exploding, or copying the greyed linework makes them colored again. But then if I regen/regenall, they return grey. Similarly, saving the dwg and reopening it returns the same problem.
I looked at the display plot style check box and its unchecked. This is driving me insane, please help.
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