I've noticed that the Zoom capability of VW 8.5.2 is not very reliable especially at high resolutions. Objects seem to appear fine in blocks (and nested blocks). But certain objects seem to disappear at random. upon zooming in the drawing. This is very, very aggravating.
Anyone else have the same problems? BTW, I'm using a G4/500, 512 MB ram, ATI 128 with 32 MB VRAM. On a PC things seem to be even more unpredictable.