SW2006 Sp4.1 AMD 64 FX-55 2Mb Quadro FX 540 128Mb Assembly consists of about 700 unique parts. No trouble with shaded or hidden line rotation or anything else in the assembly mode. Create a drawing and add a view - OK so far. Add three more views (projections) - OK. Move mouse randomly and all views go blank. There doesn't seem anyway to get them to display again. Deleting all but one view doesn't help. Another try involved placing the first view, clicking the check and as soon as the hourglass disappeared so did the drawing entities. Memory shows about 1meg left. I have worked with fairly large assemblies before and have never seen a problem like this. Any insight would be appreciated. Gary