It happened to me me just now after printing (3 page BW spec sheet, mostly text with 1 embedded vector graphic) and switching to another app (illustrator) and back again. So what's the common denominator other than we're using Macs, Indesign CS2 and OS X?

MDD Dual 867 G4/1.25 Gb RAM/200 Gb, 80 Gb Drives/Mac OS X 10.4.8/Adobe CS2 with all updates applied

Scott