point clouds disappearing Bricscad Platinum V19

if i bring in a point cloud, large thou 500mb...and i can work with it, overlay 3d model, sections, dims, everything
etc..but switch on perspective, zoom closer, still only 1/2 the screen, and the pointcloud disappears. perspective off, cloud is back.
so i change bricscad to 3m points, and do the same, same, perspective, zoom...cloud disappears at 50% screen or closer.
Strange part, the pointcloud only disappears when it perspective on, UCS W, and anytime you are in the -X sectors..all other Y and Z areas work fine.

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