Is there a maximum memory allocation for all R windows open? because it is like 1-3 million runs.... so... it may be reaching some sort of memory limit -- View this message in context: http://r.789695.n4.nabble.com/Objects-disappearing-in-my-R-work-space-tp4104389p4106390.html Sent from the R help mailing list archive at Nabble.com.