Hi David, this is Drew from QA on LayOut. Would you mind sharing a copy of the file with me directly? If we have it in house we can run some diagnostics on it and hopefully tease out the error. This issue is nearly impossible for us to re-create from scratch. You mentioned that is has been occurring for some time for you. Do you recall the earliest version of LayOut you saw it on? Also, what type of machine are you using? Thanks David and I'm sorry for this frustrating issue. My email address is drew@sketchup.com if you'd like to talk directly or send a file.