Well, the element may be vector, but the drop shadow is not. From all sorts of glitches due to running out of resources to this merely being a preview artifact to various other things this could be anything. You have not provided any info on the details for the document and raster effects DPI settings, your system or even what version of AI you use, so nobody can say anything beyond that.
Hi, sorry for the minimum information, first time i place a question here, i have illustrator cc (17.1) on a macbook pro.
Here is a direct download link to the file:Dropbox - 700x700mm_mengerink.ai,
Hope thats enough?
does it show at different zoom levels? does it print? does it show if you export to PDF?
is shows in different zoom levels and print but not if the file is smaller then 400mm