The only time i ever saw this was after doing a 50 tree multi-replicate, doing a distribute/size, not liking what i had, deleteing, repeat twice and - viola! The message. I had saved immediately before trying this though so was not too stung. I now, when getting into very large (my def is 65Mb or bigger models) save on a more frequent basis. To date I have not had this happen again. I run a P4 1.8 with 512 Mb RAMBUS using W98SE.

Pass no temptation lightly by, for one never knows when it may pass again!